257608081 has 4 divisors (see below), whose sum is σ = 263089152. Its totient is φ = 252127012.

The previous prime is 257608051. The next prime is 257608103. The reversal of 257608081 is 180806752.

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 257608081 - 2⁵ = 257608049 is a prime.

It is a super-2 number, since 2×257608081² = 132723846793005122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 257608081.

It is not an unprimeable number, because it can be changed into a prime (257608031) 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, 2740465 + ... + 2740558.

It is an arithmetic number, because the mean of its divisors is an integer number (65772288).

Almost surely, 2^257608081 is an apocalyptic number.

It is an amenable number.

257608081 is a deficient number, since it is larger than the sum of its proper divisors (5481071).

257608081 is an equidigital number, since it uses as much as digits as its factorization.

257608081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5481070.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 257608081 is about 16050.1738619867. The cubic root of 257608081 is about 636.2871619981.

The spelling of 257608081 in words is "two hundred fifty-seven million, six hundred eight thousand, eighty-one".