231321123131 has 16 divisors (see below), whose sum is σ = 264836748288. Its totient is φ = 197923132800.

The previous prime is 231321123101. The next prime is 231321123149. The reversal of 231321123131 is 131321123132.

It is a cyclic number.

It is not a de Polignac number, because 231321123131 - 2¹⁰ = 231321122107 is a prime.

It is a super-2 number, since 2×231321123131² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231321123097 and 231321123106.

It is not an unprimeable number, because it can be changed into a prime (231321123101) 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, 19879091 + ... + 19890723.

It is an arithmetic number, because the mean of its divisors is an integer number (16552296768).

Almost surely, 2^231321123131 is an apocalyptic number.

231321123131 is a deficient number, since it is larger than the sum of its proper divisors (33515625157).

231321123131 is a wasteful number, since it uses less digits than its factorization.

231321123131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16442.

The product of its digits is 648, while the sum is 23.

Adding to 231321123131 its reverse (131321123132), we get a palindrome (362642246263).

Subtracting from 231321123131 its reverse (131321123132), we obtain a palindrome (99999999999).

The spelling of 231321123131 in words is "two hundred thirty-one billion, three hundred twenty-one million, one hundred twenty-three thousand, one hundred thirty-one".