231032313331 has 4 divisors (see below), whose sum is σ = 231854492664. Its totient is φ = 230210134000.

The previous prime is 231032313299. The next prime is 231032313359. The reversal of 231032313331 is 133313230132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 231032313331 - 2⁵ = 231032313299 is a prime.

It is a super-2 number, since 2×231032313331² (a number of 24 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 = 231032313296 and 231032313305.

It is not an unprimeable number, because it can be changed into a prime (231032313431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 411089245 + ... + 411089806.

It is an arithmetic number, because the mean of its divisors is an integer number (57963623166).

Almost surely, 2^231032313331 is an apocalyptic number.

231032313331 is a deficient number, since it is larger than the sum of its proper divisors (822179333).

231032313331 is an equidigital number, since it uses as much as digits as its factorization.

231032313331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822179332.

The product of its (nonzero) digits is 2916, while the sum is 25.

Adding to 231032313331 its reverse (133313230132), we get a palindrome (364345543463).

The spelling of 231032313331 in words is "two hundred thirty-one billion, thirty-two million, three hundred thirteen thousand, three hundred thirty-one".