979138257 has 4 divisors (see below), whose sum is σ = 1305517680. Its totient is φ = 652758836.

The previous prime is 979138253. The next prime is 979138283. The reversal of 979138257 is 752831979.

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 979138257 - 2² = 979138253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (979138253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163189707 + ... + 163189712.

It is an arithmetic number, because the mean of its divisors is an integer number (326379420).

Almost surely, 2^979138257 is an apocalyptic number.

It is an amenable number.

979138257 is a deficient number, since it is larger than the sum of its proper divisors (326379423).

979138257 is a wasteful number, since it uses less digits than its factorization.

979138257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326379422.

The product of its digits is 952560, while the sum is 51.

The square root of 979138257 is about 31291.1849727683. The cubic root of 979138257 is about 992.9971603764.

The spelling of 979138257 in words is "nine hundred seventy-nine million, one hundred thirty-eight thousand, two hundred fifty-seven".