257731049 has 4 divisors (see below), whose sum is σ = 258661764. Its totient is φ = 256800336.

The previous prime is 257731021. The next prime is 257731051. The reversal of 257731049 is 940137752.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 118962649 + 138768400 = 10907^2 + 11780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257731049 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (257731009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 464942 + ... + 465495.

It is an arithmetic number, because the mean of its divisors is an integer number (64665441).

Almost surely, 2^257731049 is an apocalyptic number.

It is an amenable number.

257731049 is a deficient number, since it is larger than the sum of its proper divisors (930715).

257731049 is an equidigital number, since it uses as much as digits as its factorization.

257731049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930714.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 257731049 is about 16054.0041422693. The cubic root of 257731049 is about 636.3883887830.

The spelling of 257731049 in words is "two hundred fifty-seven million, seven hundred thirty-one thousand, forty-nine".