979989977 has 2 divisors, whose sum is σ = 979989978. Its totient is φ = 979989976.

The previous prime is 979989937. The next prime is 979989979. The reversal of 979989977 is 779989979.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 660438601 + 319551376 = 25699^2 + 17876^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-979989977 is a prime.

Together with 979989979, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (979989979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489994988 + 489994989.

It is an arithmetic number, because the mean of its divisors is an integer number (489994989).

Almost surely, 2^979989977 is an apocalyptic number.

It is an amenable number.

979989977 is a deficient number, since it is larger than the sum of its proper divisors (1).

979989977 is an equidigital number, since it uses as much as digits as its factorization.

979989977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162030456, while the sum is 74.

The square root of 979989977 is about 31304.7915980925. The cubic root of 979989977 is about 993.2850020652.

The spelling of 979989977 in words is "nine hundred seventy-nine million, nine hundred eighty-nine thousand, nine hundred seventy-seven".