231391004 has 48 divisors (see below), whose sum is σ = 448846272. Its totient is φ = 103713792.

The previous prime is 231391001. The next prime is 231391021. The reversal of 231391004 is 400193132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231391001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 311057 + ... + 311799.

It is an arithmetic number, because the mean of its divisors is an integer number (9350964).

Almost surely, 2^231391004 is an apocalyptic number.

It is an amenable number.

231391004 is a deficient number, since it is larger than the sum of its proper divisors (217455268).

231391004 is a wasteful number, since it uses less digits than its factorization.

231391004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926 (or 924 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 231391004 is about 15211.5418021974. The cubic root of 231391004 is about 613.9252420945.

The spelling of 231391004 in words is "two hundred thirty-one million, three hundred ninety-one thousand, four".