257057761 has 4 divisors (see below), whose sum is σ = 260894512. Its totient is φ = 253221012.

The previous prime is 257057743. The next prime is 257057789. The reversal of 257057761 is 167750752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 257057761 - 2²³ = 248669153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257057161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1918275 + ... + 1918408.

It is an arithmetic number, because the mean of its divisors is an integer number (65223628).

Almost surely, 2^257057761 is an apocalyptic number.

It is an amenable number.

257057761 is a deficient number, since it is larger than the sum of its proper divisors (3836751).

257057761 is an equidigital number, since it uses as much as digits as its factorization.

257057761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3836750.

The product of its (nonzero) digits is 102900, while the sum is 40.

The square root of 257057761 is about 16033.0209567630. The cubic root of 257057761 is about 635.8337455883.

The spelling of 257057761 in words is "two hundred fifty-seven million, fifty-seven thousand, seven hundred sixty-one".