989595979 has 2 divisors, whose sum is σ = 989595980. Its totient is φ = 989595978.

The previous prime is 989595931. The next prime is 989595989. The reversal of 989595979 is 979595989.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 989595979 - 2²³ = 981207371 is a prime.

It is not a weakly prime, because it can be changed into another prime (989595989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494797989 + 494797990.

It is an arithmetic number, because the mean of its divisors is an integer number (494797990).

Almost surely, 2^989595979 is an apocalyptic number.

989595979 is a deficient number, since it is larger than the sum of its proper divisors (1).

989595979 is an equidigital number, since it uses as much as digits as its factorization.

989595979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82668600, while the sum is 70.

The square root of 989595979 is about 31457.8444747888. The cubic root of 989595979 is about 996.5198959250.

The spelling of 989595979 in words is "nine hundred eighty-nine million, five hundred ninety-five thousand, nine hundred seventy-nine".