257480081 has 4 divisors (see below), whose sum is σ = 258430464. Its totient is φ = 256529700.

The previous prime is 257480051. The next prime is 257480089. The reversal of 257480081 is 180084752.

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 a de Polignac number, because none of the positive numbers 2^k-257480081 is a prime.

It is a super-2 number, since 2×257480081² = 132591984223533122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257480089) 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, 474785 + ... + 475326.

It is an arithmetic number, because the mean of its divisors is an integer number (64607616).

Almost surely, 2^257480081 is an apocalyptic number.

It is an amenable number.

257480081 is a deficient number, since it is larger than the sum of its proper divisors (950383).

257480081 is an equidigital number, since it uses as much as digits as its factorization.

257480081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950382.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 257480081 is about 16046.1858707918. The cubic root of 257480081 is about 636.1817586667.

The spelling of 257480081 in words is "two hundred fifty-seven million, four hundred eighty thousand, eighty-one".