257250997 has 4 divisors (see below), whose sum is σ = 257399500. Its totient is φ = 257102496.

The previous prime is 257250977. The next prime is 257251003. The reversal of 257250997 is 799052752.

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 17589636 + 239661361 = 4194^2 + 15481^2 .

It is a cyclic number.

It is not a de Polignac number, because 257250997 - 2⁷ = 257250869 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 (257250977) 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, 71622 + ... + 75127.

It is an arithmetic number, because the mean of its divisors is an integer number (64349875).

Almost surely, 2^257250997 is an apocalyptic number.

It is an amenable number.

257250997 is a deficient number, since it is larger than the sum of its proper divisors (148503).

257250997 is a wasteful number, since it uses less digits than its factorization.

257250997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148502.

The product of its (nonzero) digits is 396900, while the sum is 46.

The square root of 257250997 is about 16039.0460127777. The cubic root of 257250997 is about 635.9930291089.

The spelling of 257250997 in words is "two hundred fifty-seven million, two hundred fifty thousand, nine hundred ninety-seven".