978520979 has 4 divisors (see below), whose sum is σ = 978744984. Its totient is φ = 978296976.

The previous prime is 978520937. The next prime is 978520999. The reversal of 978520979 is 979025879.

978520979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 978520979 - 2²⁰ = 977472403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978520999) 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, 105317 + ... + 114230.

It is an arithmetic number, because the mean of its divisors is an integer number (244686246).

Almost surely, 2^978520979 is an apocalyptic number.

978520979 is a deficient number, since it is larger than the sum of its proper divisors (224005).

978520979 is a wasteful number, since it uses less digits than its factorization.

978520979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224004.

The product of its (nonzero) digits is 2857680, while the sum is 56.

The square root of 978520979 is about 31281.3199689527. The cubic root of 978520979 is about 992.7884448212.

The spelling of 978520979 in words is "nine hundred seventy-eight million, five hundred twenty thousand, nine hundred seventy-nine".