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1213663121 = 11247744543
BaseRepresentation
bin100100001010111…
…0000011110010001
310010120201110210222
41020111300132101
54441144204441
6320233002425
742034652306
oct11025603621
93116643728
101213663121
11573099080
1229a553415
13164599478
14b72890ad
1571838d4b
hex48570791

1213663121 has 8 divisors (see below), whose sum is σ = 1324560384. Its totient is φ = 1102859920.

The previous prime is 1213663117. The next prime is 1213663123.

1213663121 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1213663121 - 22 = 1213663117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1213663123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4976 + ... + 49518.

It is an arithmetic number, because the mean of its divisors is an integer number (165570048).

Almost surely, 21213663121 is an apocalyptic number.

1213663121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1213663121 is a deficient number, since it is larger than the sum of its proper divisors (110897263).

1213663121 is a wasteful number, since it uses less digits than its factorization.

1213663121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47031.

The product of its digits is 1296, while the sum is 26.

The square root of 1213663121 is about 34837.6681337887. The cubic root of 1213663121 is about 1066.6764785013.

It can be divided in two parts, 12136 and 63121, that added together give a palindrome (75257).

The spelling of 1213663121 in words is "one billion, two hundred thirteen million, six hundred sixty-three thousand, one hundred twenty-one".

Divisors: 1 11 2477 27247 44543 489973 110333011 1213663121