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31203313113 = 3747791392879
BaseRepresentation
bin11101000011110111…
…001100010111011001
32222112121112112122110
4131003313030113121
51002401022004423
622200135142533
72153150533230
oct350367142731
988477475573
1031203313113
1112262502a85
126069b14a49
132c337795ab
14172019bb17
15c295bb193
hex743dcc5d9

31203313113 has 64 divisors (see below), whose sum is σ = 49545216000. Its totient is φ = 17100293184.

The previous prime is 31203313081. The next prime is 31203313117. The reversal of 31203313113 is 31131330213.

It is not a de Polignac number, because 31203313113 - 25 = 31203313081 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 31203313113.

It is not an unprimeable number, because it can be changed into a prime (31203313117) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10836808 + ... + 10839686.

It is an arithmetic number, because the mean of its divisors is an integer number (774144000).

Almost surely, 231203313113 is an apocalyptic number.

It is an amenable number.

31203313113 is a deficient number, since it is larger than the sum of its proper divisors (18341902887).

31203313113 is a wasteful number, since it uses less digits than its factorization.

31203313113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3154.

The product of its (nonzero) digits is 486, while the sum is 21.

Adding to 31203313113 its reverse (31131330213), we get a palindrome (62334643326).

The spelling of 31203313113 in words is "thirty-one billion, two hundred three million, three hundred thirteen thousand, one hundred thirteen".

Divisors: 1 3 7 21 47 79 139 141 237 329 417 553 973 987 1659 2879 2919 3713 6533 8637 10981 11139 19599 20153 25991 32943 45731 60459 76867 77973 135313 137193 227441 230601 400181 405939 516107 682323 947191 1200543 1548321 1592087 2801267 2841573 3612749 4776261 8403801 10689727 10838247 18808507 31614299 32069181 56425521 74828089 94842897 131659549 221300093 224484267 394978647 663900279 1485872053 4457616159 10401104371 31203313113