979081921 has 8 divisors (see below), whose sum is σ = 1016807264. Its totient is φ = 942036480.

The previous prime is 979081919. The next prime is 979081937. The reversal of 979081921 is 129180979.

It is a happy number.

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 979081921 - 2¹ = 979081919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (979081021) 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, 167040 + ... + 172801.

It is an arithmetic number, because the mean of its divisors is an integer number (127100908).

Almost surely, 2^979081921 is an apocalyptic number.

It is an amenable number.

979081921 is a deficient number, since it is larger than the sum of its proper divisors (37725343).

979081921 is a wasteful number, since it uses less digits than its factorization.

979081921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339951.

The product of its (nonzero) digits is 81648, while the sum is 46.

The square root of 979081921 is about 31290.2847701966. The cubic root of 979081921 is about 992.9781155478.

The spelling of 979081921 in words is "nine hundred seventy-nine million, eighty-one thousand, nine hundred twenty-one".