257290997 has 4 divisors (see below), whose sum is σ = 257574336. Its totient is φ = 257007660.

The previous prime is 257290993. The next prime is 257291003. The reversal of 257290997 is 799092752.

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 257290997 - 2² = 257290993 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 (257290993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140303 + ... + 142124.

It is an arithmetic number, because the mean of its divisors is an integer number (64393584).

Almost surely, 2^257290997 is an apocalyptic number.

It is an amenable number.

257290997 is a deficient number, since it is larger than the sum of its proper divisors (283339).

257290997 is an equidigital number, since it uses as much as digits as its factorization.

257290997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283338.

The product of its (nonzero) digits is 714420, while the sum is 50.

The square root of 257290997 is about 16040.2929212655. The cubic root of 257290997 is about 636.0259909542.

The spelling of 257290997 in words is "two hundred fifty-seven million, two hundred ninety thousand, nine hundred ninety-seven".