257071851 has 12 divisors (see below), whose sum is σ = 387470928. Its totient is φ = 163929744.

The previous prime is 257071849. The next prime is 257071853. The reversal of 257071851 is 158170752.

257071851 is a `hidden beast` number, since 2 + 570 + 7 + 1 + 85 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (257071849) and next prime (257071853).

It is not a de Polignac number, because 257071851 - 2¹ = 257071849 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (257071853) 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 11 ways as a sum of consecutive naturals, for example, 620740 + ... + 621153.

It is an arithmetic number, because the mean of its divisors is an integer number (32289244).

Almost surely, 2^257071851 is an apocalyptic number.

257071851 is a deficient number, since it is larger than the sum of its proper divisors (130399077).

257071851 is a wasteful number, since it uses less digits than its factorization.

257071851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241922 (or 1241919 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 36.

The square root of 257071851 is about 16033.4603563922. The cubic root of 257071851 is about 635.8453626062.

The spelling of 257071851 in words is "two hundred fifty-seven million, seventy-one thousand, eight hundred fifty-one".