257084691 has 4 divisors (see below), whose sum is σ = 342779592. Its totient is φ = 171389792.

The previous prime is 257084677. The next prime is 257084699. The reversal of 257084691 is 196480752.

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 257084691 - 2⁶ = 257084627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (257084699) 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, 42847446 + ... + 42847451.

It is an arithmetic number, because the mean of its divisors is an integer number (85694898).

Almost surely, 2^257084691 is an apocalyptic number.

257084691 is a deficient number, since it is larger than the sum of its proper divisors (85694901).

257084691 is an equidigital number, since it uses as much as digits as its factorization.

257084691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85694900.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 257084691 is about 16033.8607640206. The cubic root of 257084691 is about 635.8559486460.

The spelling of 257084691 in words is "two hundred fifty-seven million, eighty-four thousand, six hundred ninety-one".