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131001031221 = 31710724006053
BaseRepresentation
bin111101000000001000…
…1010001101000110101
3110112010200112220022020
41322000101101220311
54121242230444341
6140103034423353
712315220251504
oct1720021215065
9415120486266
10131001031221
1150614737765
122147bb91b59
13c4793b31b8
1464aa40483b
15361ab9a566
hex1e80451a35

131001031221 has 16 divisors (see below), whose sum is σ = 186671075904. Its totient is φ = 81428528384.

The previous prime is 131001031181. The next prime is 131001031247. The reversal of 131001031221 is 122130100131.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 131001031221 - 213 = 131001023029 is a prime.

It is a super-2 number, since 2×1310010312212 (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 131001031221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131001031921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11997570 + ... + 12008483.

It is an arithmetic number, because the mean of its divisors is an integer number (11666942244).

Almost surely, 2131001031221 is an apocalyptic number.

It is an amenable number.

131001031221 is a deficient number, since it is larger than the sum of its proper divisors (55670044683).

131001031221 is a wasteful number, since it uses less digits than its factorization.

131001031221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24006180.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 131001031221 its reverse (122130100131), we get a palindrome (253131131352).

The spelling of 131001031221 in words is "one hundred thirty-one billion, one million, thirty-one thousand, two hundred twenty-one".

Divisors: 1 3 17 51 107 321 1819 5457 24006053 72018159 408102901 1224308703 2568647671 7705943013 43667010407 131001031221