231131023 has 4 divisors (see below), whose sum is σ = 231207840. Its totient is φ = 231054208.

The previous prime is 231130973. The next prime is 231131041. The reversal of 231131023 is 320131132.

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 231131023 - 2⁹ = 231130511 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231130988 and 231131006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231131053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33703 + ... + 39976.

It is an arithmetic number, because the mean of its divisors is an integer number (57801960).

Almost surely, 2^231131023 is an apocalyptic number.

231131023 is a deficient number, since it is larger than the sum of its proper divisors (76817).

231131023 is an equidigital number, since it uses as much as digits as its factorization.

231131023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76816.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 231131023 is about 15202.9938827851. The cubic root of 231131023 is about 613.6952292454.

Adding to 231131023 its reverse (320131132), we get a palindrome (551262155).

The spelling of 231131023 in words is "two hundred thirty-one million, one hundred thirty-one thousand, twenty-three".