257065 has 4 divisors (see below), whose sum is σ = 308484. Its totient is φ = 205648.

The previous prime is 257053. The next prime is 257069. The reversal of 257065 is 560752.

It is a happy number.

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 90601 + 166464 = 301^2 + 408^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257065 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257069) 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, 25702 + ... + 25711.

It is an arithmetic number, because the mean of its divisors is an integer number (77121).

2²⁵⁷⁰⁶⁵ is an apocalyptic number.

It is an amenable number.

257065 is a deficient number, since it is larger than the sum of its proper divisors (51419).

257065 is an equidigital number, since it uses as much as digits as its factorization.

257065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51418.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 257065 is about 507.0157788472. The cubic root of 257065 is about 63.5839714101.

The spelling of 257065 in words is "two hundred fifty-seven thousand, sixty-five".