231123012131 has 32 divisors (see below), whose sum is σ = 261792000000. Its totient is φ = 202118837760.

The previous prime is 231123012103. The next prime is 231123012161. The reversal of 231123012131 is 131210321132.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 231123012131 - 2¹⁸ = 231122749987 is a prime.

It is a super-2 number, since 2×231123012131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231123012161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 160612910 + ... + 160614348.

It is an arithmetic number, because the mean of its divisors is an integer number (8181000000).

Almost surely, 2^231123012131 is an apocalyptic number.

231123012131 is a deficient number, since it is larger than the sum of its proper divisors (30668987869).

231123012131 is a wasteful number, since it uses less digits than its factorization.

231123012131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2987.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 231123012131 its reverse (131210321132), we get a palindrome (362333333263).

The spelling of 231123012131 in words is "two hundred thirty-one billion, one hundred twenty-three million, twelve thousand, one hundred thirty-one".