231023131 has 4 divisors (see below), whose sum is σ = 235382112. Its totient is φ = 226664152.

The previous prime is 231023119. The next prime is 231023141. The reversal of 231023131 is 131320132.

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 231023131 - 2⁵ = 231023099 is a prime.

It is a super-2 number, since 2×231023131² = 106743374114086322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231023101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2179411 + ... + 2179516.

It is an arithmetic number, because the mean of its divisors is an integer number (58845528).

Almost surely, 2^231023131 is an apocalyptic number.

231023131 is a deficient number, since it is larger than the sum of its proper divisors (4358981).

231023131 is an equidigital number, since it uses as much as digits as its factorization.

231023131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4358980.

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

The square root of 231023131 is about 15199.4450885550. The cubic root of 231023131 is about 613.5997233714.

Adding to 231023131 its reverse (131320132), we get a palindrome (362343263).

The spelling of 231023131 in words is "two hundred thirty-one million, twenty-three thousand, one hundred thirty-one".