257248401 has 4 divisors (see below), whose sum is σ = 342997872. Its totient is φ = 171498932.

The previous prime is 257248363. The next prime is 257248441. The reversal of 257248401 is 104842752.

257248401 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, 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 257248401 - 2¹⁰ = 257247377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (257248441) 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, 42874731 + ... + 42874736.

It is an arithmetic number, because the mean of its divisors is an integer number (85749468).

Almost surely, 2^257248401 is an apocalyptic number.

It is an amenable number.

257248401 is a deficient number, since it is larger than the sum of its proper divisors (85749471).

257248401 is an equidigital number, since it uses as much as digits as its factorization.

257248401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85749470.

The product of its (nonzero) digits is 17920, while the sum is 33.

The square root of 257248401 is about 16038.9650850671. The cubic root of 257248401 is about 635.9908897671.

The spelling of 257248401 in words is "two hundred fifty-seven million, two hundred forty-eight thousand, four hundred one".