231391280 has 40 divisors (see below), whose sum is σ = 538639632. Its totient is φ = 92443904.

The previous prime is 231391243. The next prime is 231391327. The reversal of 231391280 is 82193132.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103454 + ... + 105666.

Almost surely, 2^231391280 is an apocalyptic number.

231391280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231391280 is an abundant number, since it is smaller than the sum of its proper divisors (307248352).

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

231391280 is a wasteful number, since it uses less digits than its factorization.

231391280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3533 (or 3527 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 231391280 is about 15211.5508742534. The cubic root of 231391280 is about 613.9254861882.

The spelling of 231391280 in words is "two hundred thirty-one million, three hundred ninety-one thousand, two hundred eighty".