231121131131 has 16 divisors (see below), whose sum is σ = 257100749568. Its totient is φ = 206010012000.

The previous prime is 231121131091. The next prime is 231121131139. The reversal of 231121131131 is 131131121132.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231121131131 is a prime.

It is a super-2 number, since 2×231121131131² (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 (231121131139) 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, 895421 + ... + 1124286.

It is an arithmetic number, because the mean of its divisors is an integer number (16068796848).

Almost surely, 2^231121131131 is an apocalyptic number.

231121131131 is a deficient number, since it is larger than the sum of its proper divisors (25979618437).

231121131131 is a wasteful number, since it uses less digits than its factorization.

231121131131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2019922.

The product of its digits is 108, while the sum is 20.

Adding to 231121131131 its reverse (131131121132), we get a palindrome (362252252263).

Subtracting from 231121131131 its reverse (131131121132), we obtain a palindrome (99990009999).

The spelling of 231121131131 in words is "two hundred thirty-one billion, one hundred twenty-one million, one hundred thirty-one thousand, one hundred thirty-one".