231491320 has 32 divisors (see below), whose sum is σ = 543503520. Its totient is φ = 88570240.

The previous prime is 231491287. The next prime is 231491321. The reversal of 231491320 is 23194132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231491321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124891 + ... + 126730.

It is an arithmetic number, because the mean of its divisors is an integer number (16984485).

Almost surely, 2^231491320 is an apocalyptic number.

231491320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231491320 is an abundant number, since it is smaller than the sum of its proper divisors (312012200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231491320 is a wasteful number, since it uses less digits than its factorization.

231491320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251655 (or 251651 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 231491320 is about 15214.8388095306. The cubic root of 231491320 is about 614.0139485491.

The spelling of 231491320 in words is "two hundred thirty-one million, four hundred ninety-one thousand, three hundred twenty".