231144921 has 80 divisors (see below), whose sum is σ = 413390208. Its totient is φ = 125971200.

The previous prime is 231144857. The next prime is 231144923. The reversal of 231144921 is 129441132.

It is a happy number.

It is not a de Polignac number, because 231144921 - 2⁶ = 231144857 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231144923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1417986 + ... + 1418148.

Almost surely, 2^231144921 is an apocalyptic number.

231144921 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

231144921 is a deficient number, since it is larger than the sum of its proper divisors (182245287).

231144921 is a wasteful number, since it uses less digits than its factorization.

231144921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284 (or 275 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 231144921 is about 15203.4509569374. The cubic root of 231144921 is about 613.7075295779.

The spelling of 231144921 in words is "two hundred thirty-one million, one hundred forty-four thousand, nine hundred twenty-one".