231123081 has 16 divisors (see below), whose sum is σ = 355307904. Its totient is φ = 130900224.

The previous prime is 231123043. The next prime is 231123107. The reversal of 231123081 is 180321132.

It is a de Polignac number, because none of the positive numbers 2^k-231123081 is a prime.

It is a super-2 number, since 2×231123081² = 106835757141865122, which contains 22 as substring.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231123031) 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 15 ways as a sum of consecutive naturals, for example, 46326 + ... + 51071.

It is an arithmetic number, because the mean of its divisors is an integer number (22206744).

Almost surely, 2^231123081 is an apocalyptic number.

231123081 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

231123081 is a deficient number, since it is larger than the sum of its proper divisors (124184823).

231123081 is a wasteful number, since it uses less digits than its factorization.

231123081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97520.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 231123081 is about 15202.7326819885. The cubic root of 231123081 is about 613.6882000096.

The spelling of 231123081 in words is "two hundred thirty-one million, one hundred twenty-three thousand, eighty-one".