231133130031 has 4 divisors (see below), whose sum is σ = 308177506712. Its totient is φ = 154088753352.

The previous prime is 231133130027. The next prime is 231133130083. The reversal of 231133130031 is 130031331132.

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

It is not a de Polignac number, because 231133130031 - 2² = 231133130027 is a prime.

It is a super-2 number, since 2×231133130031² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231133130831) 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, 38522188336 + ... + 38522188341.

It is an arithmetic number, because the mean of its divisors is an integer number (77044376678).

Almost surely, 2^231133130031 is an apocalyptic number.

231133130031 is a deficient number, since it is larger than the sum of its proper divisors (77044376681).

231133130031 is an equidigital number, since it uses as much as digits as its factorization.

231133130031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77044376680.

The product of its (nonzero) digits is 486, while the sum is 21.

Adding to 231133130031 its reverse (130031331132), we get a palindrome (361164461163).

The spelling of 231133130031 in words is "two hundred thirty-one billion, one hundred thirty-three million, one hundred thirty thousand, thirty-one".