231085457 has 2 divisors, whose sum is σ = 231085458. Its totient is φ = 231085456.

The previous prime is 231085453. The next prime is 231085469. The reversal of 231085457 is 754580132.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185940496 + 45144961 = 13636^2 + 6719^2 .

It is a cyclic number.

It is not a de Polignac number, because 231085457 - 2² = 231085453 is a prime.

It is equal to p_12699017 and since 231085457 and 12699017 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (231085453) 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 as a sum of consecutive naturals, namely, 115542728 + 115542729.

It is an arithmetic number, because the mean of its divisors is an integer number (115542729).

Almost surely, 2^231085457 is an apocalyptic number.

It is an amenable number.

231085457 is a deficient number, since it is larger than the sum of its proper divisors (1).

231085457 is an equidigital number, since it uses as much as digits as its factorization.

231085457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33600, while the sum is 35.

The square root of 231085457 is about 15201.4952225102. The cubic root of 231085457 is about 613.6548979010.

The spelling of 231085457 in words is "two hundred thirty-one million, eighty-five thousand, four hundred fifty-seven".