979519821 has 32 divisors (see below), whose sum is σ = 1594453248. Its totient is φ = 522117120.

The previous prime is 979519811. The next prime is 979519841. The reversal of 979519821 is 128915979.

It is not a de Polignac number, because 979519821 - 2⁷ = 979519693 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (979519811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28201 + ... + 52481.

It is an arithmetic number, because the mean of its divisors is an integer number (49826664).

Almost surely, 2^979519821 is an apocalyptic number.

It is an amenable number.

979519821 is a deficient number, since it is larger than the sum of its proper divisors (614933427).

979519821 is a wasteful number, since it uses less digits than its factorization.

979519821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24421.

The product of its digits is 408240, while the sum is 51.

The square root of 979519821 is about 31297.2813675565. The cubic root of 979519821 is about 993.1261318671.

The spelling of 979519821 in words is "nine hundred seventy-nine million, five hundred nineteen thousand, eight hundred twenty-one".