257982297 has 4 divisors (see below), whose sum is σ = 343976400. Its totient is φ = 171988196.

The previous prime is 257982287. The next prime is 257982317. The reversal of 257982297 is 792289752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 257982297 - 2⁷ = 257982169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (257982287) 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 3 ways as a sum of consecutive naturals, for example, 42997047 + ... + 42997052.

It is an arithmetic number, because the mean of its divisors is an integer number (85994100).

Almost surely, 2^257982297 is an apocalyptic number.

It is an amenable number.

257982297 is a deficient number, since it is larger than the sum of its proper divisors (85994103).

257982297 is an equidigital number, since it uses as much as digits as its factorization.

257982297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85994102.

The product of its digits is 1270080, while the sum is 51.

The square root of 257982297 is about 16061.8273244360. The cubic root of 257982297 is about 636.5951151129.

The spelling of 257982297 in words is "two hundred fifty-seven million, nine hundred eighty-two thousand, two hundred ninety-seven".