231331320031 has 8 divisors (see below), whose sum is σ = 264992062464. Its totient is φ = 197823930360.

The previous prime is 231331320007. The next prime is 231331320049. The reversal of 231331320031 is 130023133132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 231331320031 - 2⁷ = 231331319903 is a prime.

It is a super-2 number, since 2×231331320031² (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 = 231331319984 and 231331320011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231331320061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38334955 + ... + 38340988.

It is an arithmetic number, because the mean of its divisors is an integer number (33124007808).

Almost surely, 2^231331320031 is an apocalyptic number.

231331320031 is a deficient number, since it is larger than the sum of its proper divisors (33660742433).

231331320031 is an equidigital number, since it uses as much as digits as its factorization.

231331320031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76676381.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 231331320031 its reverse (130023133132), we get a palindrome (361354453163).

The spelling of 231331320031 in words is "two hundred thirty-one billion, three hundred thirty-one million, three hundred twenty thousand, thirty-one".