257677513 has 4 divisors (see below), whose sum is σ = 258080148. Its totient is φ = 257274880.

The previous prime is 257677489. The next prime is 257677529. The reversal of 257677513 is 315776752.

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 192987664 + 64689849 = 13892^2 + 8043^2 .

It is a cyclic number.

It is not a de Polignac number, because 257677513 - 2¹⁷ = 257546441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 257677513.

It is not an unprimeable number, because it can be changed into a prime (254677513) 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, 200356 + ... + 201637.

It is an arithmetic number, because the mean of its divisors is an integer number (64520037).

Almost surely, 2^257677513 is an apocalyptic number.

It is an amenable number.

257677513 is a deficient number, since it is larger than the sum of its proper divisors (402635).

257677513 is an equidigital number, since it uses as much as digits as its factorization.

257677513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402634.

The product of its digits is 308700, while the sum is 43.

The square root of 257677513 is about 16052.3366834863. The cubic root of 257677513 is about 636.3443221120.

It can be divided in two parts, 2576 and 77513, that added together give a square (80089 = 283²).

The spelling of 257677513 in words is "two hundred fifty-seven million, six hundred seventy-seven thousand, five hundred thirteen".