257897109 has 4 divisors (see below), whose sum is σ = 343862816. Its totient is φ = 171931404.

The previous prime is 257897077. The next prime is 257897117. The reversal of 257897109 is 901798752.

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 not a de Polignac number, because 257897109 - 2⁵ = 257897077 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 (257897119) 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, 42982849 + ... + 42982854.

It is an arithmetic number, because the mean of its divisors is an integer number (85965704).

Almost surely, 2^257897109 is an apocalyptic number.

It is an amenable number.

257897109 is a deficient number, since it is larger than the sum of its proper divisors (85965707).

257897109 is an equidigital number, since it uses as much as digits as its factorization.

257897109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85965706.

The product of its (nonzero) digits is 317520, while the sum is 48.

The square root of 257897109 is about 16059.1752278876. The cubic root of 257897109 is about 636.5250376496.

The spelling of 257897109 in words is "two hundred fifty-seven million, eight hundred ninety-seven thousand, one hundred nine".