231111113331 has 16 divisors (see below), whose sum is σ = 352425855744. Its totient is φ = 131967290784.

The previous prime is 231111113281. The next prime is 231111113369. The reversal of 231111113331 is 133311111132.

It is not a de Polignac number, because 231111113331 - 2¹³ = 231111105139 is a prime.

It is a super-2 number, since 2×231111113331² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 231111113298 and 231111113307.

It is not an unprimeable number, because it can be changed into a prime (231111113381) 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, 3978921 + ... + 4036586.

It is an arithmetic number, because the mean of its divisors is an integer number (22026615984).

Almost surely, 2^231111113331 is an apocalyptic number.

231111113331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

231111113331 is a deficient number, since it is larger than the sum of its proper divisors (121314742413).

231111113331 is a wasteful number, since it uses less digits than its factorization.

231111113331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8016890.

The product of its digits is 162, while the sum is 21.

Adding to 231111113331 its reverse (133311111132), we get a palindrome (364422224463).

The spelling of 231111113331 in words is "two hundred thirty-one billion, one hundred eleven million, one hundred thirteen thousand, three hundred thirty-one".