15653231231 has 16 divisors (see below), whose sum is σ = 17482452480. Its totient is φ = 13893199680.

The previous prime is 15653231227. The next prime is 15653231261. The reversal of 15653231231 is 13213235651.

It is a cyclic number.

It is not a de Polignac number, because 15653231231 - 2² = 15653231227 is a prime.

It is a super-2 number, since 2×15653231231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15653231261) 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, 174440 + ... + 248466.

It is an arithmetic number, because the mean of its divisors is an integer number (1092653280).

Almost surely, 2^15653231231 is an apocalyptic number.

15653231231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

15653231231 is a deficient number, since it is larger than the sum of its proper divisors (1829221249).

15653231231 is a wasteful number, since it uses less digits than its factorization.

15653231231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74494.

The product of its digits is 16200, while the sum is 32.

Adding to 15653231231 its reverse (13213235651), we get a palindrome (28866466882).

The spelling of 15653231231 in words is "fifteen billion, six hundred fifty-three million, two hundred thirty-one thousand, two hundred thirty-one".