231131321203131 has 48 divisors (see below), whose sum is σ = 356214236212224. Its totient is φ = 144077738821632.

The previous prime is 231131321203087. The next prime is 231131321203151. The reversal of 231131321203131 is 131302123131132.

231131321203131 is a `hidden beast` number, since 2 + 3 + 1 + 1 + 3 + 1 + 321 + 20 + 313 + 1 = 666.

It is not a de Polignac number, because 231131321203131 - 2⁶ = 231131321203067 is a prime.

It is a super-2 number, since 2×231131321203131² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231131321203095 and 231131321203104.

It is not an unprimeable number, because it can be changed into a prime (231131321203151) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6317446 + ... + 22409211.

It is an arithmetic number, because the mean of its divisors is an integer number (7421129921088).

Almost surely, 2^{231131321203131} is an apocalyptic number.

231131321203131 is a deficient number, since it is larger than the sum of its proper divisors (125082915009093).

231131321203131 is a wasteful number, since it uses less digits than its factorization.

231131321203131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28727560 (or 28727557 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

Adding to 231131321203131 its reverse (131302123131132), we get a palindrome (362433444334263).

The spelling of 231131321203131 in words is "two hundred thirty-one trillion, one hundred thirty-one billion, three hundred twenty-one million, two hundred three thousand, one hundred thirty-one".