979989979 has 2 divisors, whose sum is σ = 979989980. Its totient is φ = 979989978.

The previous prime is 979989977. The next prime is 979989991.

979989979 is nontrivially palindromic in base 10.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 979989979 - 2¹ = 979989977 is a prime.

Together with 979989977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (979989977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489994989 + 489994990.

It is an arithmetic number, because the mean of its divisors is an integer number (489994990).

Almost surely, 2^979989979 is an apocalyptic number.

979989979 is a deficient number, since it is larger than the sum of its proper divisors (1).

979989979 is an equidigital number, since it uses as much as digits as its factorization.

979989979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 208324872, while the sum is 76.

The square root of 979989979 is about 31304.7916300364. The cubic root of 979989979 is about 993.2850027409.

The spelling of 979989979 in words is "nine hundred seventy-nine million, nine hundred eighty-nine thousand, nine hundred seventy-nine".