23557511231 has 4 divisors (see below), whose sum is σ = 23605884432. Its totient is φ = 23509138032.

The previous prime is 23557511213. The next prime is 23557511239. The reversal of 23557511231 is 13211575532.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23557511231 is a prime.

It is a super-2 number, since 2×23557511231² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23557511191 and 23557511200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23557511239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24185870 + ... + 24186843.

It is an arithmetic number, because the mean of its divisors is an integer number (5901471108).

Almost surely, 2^23557511231 is an apocalyptic number.

23557511231 is a deficient number, since it is larger than the sum of its proper divisors (48373201).

23557511231 is an equidigital number, since it uses as much as digits as its factorization.

23557511231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48373200.

The product of its digits is 31500, while the sum is 35.

The spelling of 23557511231 in words is "twenty-three billion, five hundred fifty-seven million, five hundred eleven thousand, two hundred thirty-one".