257971253 has 4 divisors (see below), whose sum is σ = 259614540. Its totient is φ = 256327968.

The previous prime is 257971249. The next prime is 257971283. The reversal of 257971253 is 352179752.

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 146942884 + 111028369 = 12122^2 + 10537^2 .

It is a cyclic number.

It is not a de Polignac number, because 257971253 - 2² = 257971249 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 257971253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257971213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 821408 + ... + 821721.

It is an arithmetic number, because the mean of its divisors is an integer number (64903635).

Almost surely, 2^257971253 is an apocalyptic number.

It is an amenable number.

257971253 is a deficient number, since it is larger than the sum of its proper divisors (1643287).

257971253 is a wasteful number, since it uses less digits than its factorization.

257971253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1643286.

The product of its digits is 132300, while the sum is 41.

The square root of 257971253 is about 16061.4835242577. The cubic root of 257971253 is about 636.5860309537.

The spelling of 257971253 in words is "two hundred fifty-seven million, nine hundred seventy-one thousand, two hundred fifty-three".