231489657 has 20 divisors (see below), whose sum is σ = 395207296. Its totient is φ = 132279480.

The previous prime is 231489647. The next prime is 231489659. The reversal of 231489657 is 756984132.

It is not a de Polignac number, because 231489657 - 2¹⁰ = 231488633 is a prime.

It is a super-2 number, since 2×231489657² = 107174922595955298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231489659) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 203569 + ... + 204702.

Almost surely, 2^231489657 is an apocalyptic number.

231489657 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

231489657 is a deficient number, since it is larger than the sum of its proper divisors (163717639).

231489657 is an equidigital number, since it uses as much as digits as its factorization.

231489657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408290 (or 408281 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 231489657 is about 15214.7841588371. The cubic root of 231489657 is about 614.0124782166.

The spelling of 231489657 in words is "two hundred thirty-one million, four hundred eighty-nine thousand, six hundred fifty-seven".