257055091 has 4 divisors (see below), whose sum is σ = 257892712. Its totient is φ = 256217472.

The previous prime is 257055089. The next prime is 257055109. The reversal of 257055091 is 190550752.

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 257055091 - 2¹ = 257055089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257055031) 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, 418350 + ... + 418963.

It is an arithmetic number, because the mean of its divisors is an integer number (64473178).

Almost surely, 2^257055091 is an apocalyptic number.

257055091 is a deficient number, since it is larger than the sum of its proper divisors (837621).

257055091 is an equidigital number, since it uses as much as digits as its factorization.

257055091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837620.

The product of its (nonzero) digits is 15750, while the sum is 34.

The square root of 257055091 is about 16032.9376908912. The cubic root of 257055091 is about 635.8315441609.

The spelling of 257055091 in words is "two hundred fifty-seven million, fifty-five thousand, ninety-one".