231191680 has 32 divisors (see below), whose sum is σ = 552694140. Its totient is φ = 92476416.

The previous prime is 231191669. The next prime is 231191761. The reversal of 231191680 is 86191132.

It can be written as a sum of positive squares in 2 ways, for example, as 209438784 + 21752896 = 14472^2 + 4664^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 179979 + ... + 181258.

Almost surely, 2^231191680 is an apocalyptic number.

231191680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231191680 is an abundant number, since it is smaller than the sum of its proper divisors (321502460).

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

231191680 is an equidigital number, since it uses as much as digits as its factorization.

231191680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361256 (or 361244 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 231191680 is about 15204.9886550434. The cubic root of 231191680 is about 613.7489097006.

The spelling of 231191680 in words is "two hundred thirty-one million, one hundred ninety-one thousand, six hundred eighty".