231331233 has 16 divisors (see below), whose sum is σ = 357335936. Its totient is φ = 130377600.

The previous prime is 231331229. The next prime is 231331237. The reversal of 231331233 is 332133132.

It is an interprime number because it is at equal distance from previous prime (231331229) and next prime (231331237).

It is not a de Polignac number, because 231331233 - 2² = 231331229 is a prime.

It is a super-2 number, since 2×231331233² = 107028278722600578, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231331237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73918 + ... + 76983.

It is an arithmetic number, because the mean of its divisors is an integer number (22333496).

Almost surely, 2^231331233 is an apocalyptic number.

It is an amenable number.

231331233 is a deficient number, since it is larger than the sum of its proper divisors (126004703).

231331233 is a wasteful number, since it uses less digits than its factorization.

231331233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150984.

The product of its digits is 972, while the sum is 21.

The square root of 231331233 is about 15209.5770158147. The cubic root of 231331233 is about 613.8723761878.

Adding to 231331233 its reverse (332133132), we get a palindrome (563464365).

The spelling of 231331233 in words is "two hundred thirty-one million, three hundred thirty-one thousand, two hundred thirty-three".