257551157 has 4 divisors (see below), whose sum is σ = 258620076. Its totient is φ = 256482240.

The previous prime is 257551103. The next prime is 257551159. The reversal of 257551157 is 751155752.

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 164891281 + 92659876 = 12841^2 + 9626^2 .

It is a cyclic number.

It is not a de Polignac number, because 257551157 - 2¹⁰ = 257550133 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 257551157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257551159) 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, 534098 + ... + 534579.

It is an arithmetic number, because the mean of its divisors is an integer number (64655019).

Almost surely, 2^257551157 is an apocalyptic number.

It is an amenable number.

257551157 is a deficient number, since it is larger than the sum of its proper divisors (1068919).

257551157 is a wasteful number, since it uses less digits than its factorization.

257551157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068918.

The product of its digits is 61250, while the sum is 38.

The square root of 257551157 is about 16048.4004498891. The cubic root of 257551157 is about 636.2402914724.

The spelling of 257551157 in words is "two hundred fifty-seven million, five hundred fifty-one thousand, one hundred fifty-seven".