257343431 has 4 divisors (see below), whose sum is σ = 265644864. Its totient is φ = 249042000.

The previous prime is 257343397. The next prime is 257343451. The reversal of 257343431 is 134343752.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 257343431 - 2¹⁴ = 257327047 is a prime.

It is a super-2 number, since 2×257343431² = 132451282957703522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257343451) 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, 4150670 + ... + 4150731.

It is an arithmetic number, because the mean of its divisors is an integer number (66411216).

Almost surely, 2^257343431 is an apocalyptic number.

257343431 is a deficient number, since it is larger than the sum of its proper divisors (8301433).

257343431 is an equidigital number, since it uses as much as digits as its factorization.

257343431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8301432.

The product of its digits is 30240, while the sum is 32.

The square root of 257343431 is about 16041.9272844630. The cubic root of 257343431 is about 636.0691938153.

The spelling of 257343431 in words is "two hundred fifty-seven million, three hundred forty-three thousand, four hundred thirty-one".