257802081 has 4 divisors (see below), whose sum is σ = 343736112. Its totient is φ = 171868052.

The previous prime is 257802073. The next prime is 257802091. The reversal of 257802081 is 180208752.

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 257802081 - 2³ = 257802073 is a prime.

It is a super-2 number, since 2×257802081² = 132923825935861122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (257802001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42967011 + ... + 42967016.

It is an arithmetic number, because the mean of its divisors is an integer number (85934028).

Almost surely, 2^257802081 is an apocalyptic number.

It is an amenable number.

257802081 is a deficient number, since it is larger than the sum of its proper divisors (85934031).

257802081 is an equidigital number, since it uses as much as digits as its factorization.

257802081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85934030.

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 257802081 is about 16056.2162728334. The cubic root of 257802081 is about 636.4468473817.

The spelling of 257802081 in words is "two hundred fifty-seven million, eight hundred two thousand, eighty-one".