231022131 has 4 divisors (see below), whose sum is σ = 308029512. Its totient is φ = 154014752.

The previous prime is 231022123. The next prime is 231022171. The reversal of 231022131 is 131220132.

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 231022131 - 2³ = 231022123 is a prime.

It is a super-2 number, since 2×231022131² = 106742450023562322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 231022131.

It is not an unprimeable number, because it can be changed into a prime (231022171) 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, 38503686 + ... + 38503691.

It is an arithmetic number, because the mean of its divisors is an integer number (77007378).

Almost surely, 2^231022131 is an apocalyptic number.

231022131 is a deficient number, since it is larger than the sum of its proper divisors (77007381).

231022131 is an equidigital number, since it uses as much as digits as its factorization.

231022131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77007380.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 231022131 is about 15199.4121925817. The cubic root of 231022131 is about 613.5988380335.

Adding to 231022131 its reverse (131220132), we get a palindrome (362242263).

The spelling of 231022131 in words is "two hundred thirty-one million, twenty-two thousand, one hundred thirty-one".