257499971 has 4 divisors (see below), whose sum is σ = 261721344. Its totient is φ = 253278600.

The previous prime is 257499959. The next prime is 257499997. The reversal of 257499971 is 179994752.

257499971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 257499971 - 2¹⁴ = 257483587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257499911) 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, 2110595 + ... + 2110716.

It is an arithmetic number, because the mean of its divisors is an integer number (65430336).

Almost surely, 2^257499971 is an apocalyptic number.

257499971 is a deficient number, since it is larger than the sum of its proper divisors (4221373).

257499971 is an equidigital number, since it uses as much as digits as its factorization.

257499971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4221372.

The product of its digits is 1428840, while the sum is 53.

The square root of 257499971 is about 16046.8056322746. The cubic root of 257499971 is about 636.1981396482.

The spelling of 257499971 in words is "two hundred fifty-seven million, four hundred ninety-nine thousand, nine hundred seventy-one".