11231312131 has 16 divisors (see below), whose sum is σ = 12420364768. Its totient is φ = 10092211200.

The previous prime is 11231312119. The next prime is 11231312153. The reversal of 11231312131 is 13121313211.

It is a cyclic number.

It is not a de Polignac number, because 11231312131 - 2²⁵ = 11197757699 is a prime.

It is a super-2 number, since 2×11231312131² (a number of 21 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 = 11231312099 and 11231312108.

It is not an unprimeable number, because it can be changed into a prime (11231312161) 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, 3916 + ... + 149926.

It is an arithmetic number, because the mean of its divisors is an integer number (776272798).

Almost surely, 2^11231312131 is an apocalyptic number.

11231312131 is a deficient number, since it is larger than the sum of its proper divisors (1189052637).

11231312131 is a wasteful number, since it uses less digits than its factorization.

11231312131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146182.

The product of its digits is 108, while the sum is 19.

Adding to 11231312131 its reverse (13121313211), we get a palindrome (24352625342).

The spelling of 11231312131 in words is "eleven billion, two hundred thirty-one million, three hundred twelve thousand, one hundred thirty-one".