257563 has 4 divisors (see below), whose sum is σ = 259168. Its totient is φ = 255960.

The previous prime is 257561. The next prime is 257591. The reversal of 257563 is 365752.

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

It is a cyclic number.

It is not a de Polignac number, because 257563 - 2¹ = 257561 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257561) 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, 531 + ... + 892.

It is an arithmetic number, because the mean of its divisors is an integer number (64792).

2²⁵⁷⁵⁶³ is an apocalyptic number.

257563 is a deficient number, since it is larger than the sum of its proper divisors (1605).

257563 is a wasteful number, since it uses less digits than its factorization.

257563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1604.

The product of its digits is 6300, while the sum is 28.

The square root of 257563 is about 507.5066502027. The cubic root of 257563 is about 63.6250043423.

It can be divided in two parts, 257 and 563, that added together give a triangular number (820 = T₄₀).

The spelling of 257563 in words is "two hundred fifty-seven thousand, five hundred sixty-three".