257316109 has 4 divisors (see below), whose sum is σ = 257977980. Its totient is φ = 256654240.

The previous prime is 257316091. The next prime is 257316133. The reversal of 257316109 is 901613752.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 156875625 + 100440484 = 12525^2 + 10022^2 .

It is a cyclic number.

It is not a de Polignac number, because 257316109 - 2¹⁷ = 257185037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257316139) 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, 330352 + ... + 331129.

It is an arithmetic number, because the mean of its divisors is an integer number (64494495).

Almost surely, 2^257316109 is an apocalyptic number.

It is an amenable number.

257316109 is a deficient number, since it is larger than the sum of its proper divisors (661871).

257316109 is an equidigital number, since it uses as much as digits as its factorization.

257316109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661870.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 257316109 is about 16041.0756808887. The cubic root of 257316109 is about 636.0466826552.

The spelling of 257316109 in words is "two hundred fifty-seven million, three hundred sixteen thousand, one hundred nine".