257417561 has 4 divisors (see below), whose sum is σ = 259779300. Its totient is φ = 255055824.

The previous prime is 257417513. The next prime is 257417569. The reversal of 257417561 is 165714752.

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 197262025 + 60155536 = 14045^2 + 7756^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257417561 is a prime.

It is a super-2 number, since 2×257417561² = 132527601422377442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257417569) 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, 1180706 + ... + 1180923.

It is an arithmetic number, because the mean of its divisors is an integer number (64944825).

Almost surely, 2^257417561 is an apocalyptic number.

It is an amenable number.

257417561 is a deficient number, since it is larger than the sum of its proper divisors (2361739).

257417561 is a wasteful number, since it uses less digits than its factorization.

257417561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2361738.

The product of its digits is 58800, while the sum is 38.

The square root of 257417561 is about 16044.2376260139. The cubic root of 257417561 is about 636.1302630285.

The spelling of 257417561 in words is "two hundred fifty-seven million, four hundred seventeen thousand, five hundred sixty-one".