979661257 has 8 divisors (see below), whose sum is σ = 1004110632. Its totient is φ = 955238400.

The previous prime is 979661219. The next prime is 979661269. The reversal of 979661257 is 752166979.

It is a happy number.

979661257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 33856 + 979627401 = 184^2 + 31299^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 979661257 - 2⁷ = 979661129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (979665257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83073 + ... + 94129.

It is an arithmetic number, because the mean of its divisors is an integer number (125513829).

Almost surely, 2^979661257 is an apocalyptic number.

It is an amenable number.

979661257 is a deficient number, since it is larger than the sum of its proper divisors (24449375).

979661257 is a wasteful number, since it uses less digits than its factorization.

979661257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13259.

The product of its digits is 1428840, while the sum is 52.

The square root of 979661257 is about 31299.5408432776. The cubic root of 979661257 is about 993.1739297862.

The spelling of 979661257 in words is "nine hundred seventy-nine million, six hundred sixty-one thousand, two hundred fifty-seven".