257391253 has 8 divisors (see below), whose sum is σ = 294795072. Its totient is φ = 220145856.

The previous prime is 257391241. The next prime is 257391263. The reversal of 257391253 is 352193752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 257391253 - 2⁹ = 257390741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257391263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36100 + ... + 42637.

It is an arithmetic number, because the mean of its divisors is an integer number (36849384).

Almost surely, 2^257391253 is an apocalyptic number.

It is an amenable number.

257391253 is a deficient number, since it is larger than the sum of its proper divisors (37403819).

257391253 is an equidigital number, since it uses as much as digits as its factorization.

257391253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79211.

The product of its digits is 56700, while the sum is 37.

The square root of 257391253 is about 16043.4177468518. The cubic root of 257391253 is about 636.1085915142.

The spelling of 257391253 in words is "two hundred fifty-seven million, three hundred ninety-one thousand, two hundred fifty-three".