989978959 has 2 divisors, whose sum is σ = 989978960. Its totient is φ = 989978958.

The previous prime is 989978953. The next prime is 989978987. The reversal of 989978959 is 959879989.

989978959 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989978959 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 989978891 and 989978900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989978953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494989479 + 494989480.

It is an arithmetic number, because the mean of its divisors is an integer number (494989480).

Almost surely, 2^989978959 is an apocalyptic number.

989978959 is a deficient number, since it is larger than the sum of its proper divisors (1).

989978959 is an equidigital number, since it uses as much as digits as its factorization.

989978959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 132269760, while the sum is 73.

The square root of 989978959 is about 31463.9310798889. The cubic root of 989978959 is about 996.6484325450.

The spelling of 989978959 in words is "nine hundred eighty-nine million, nine hundred seventy-eight thousand, nine hundred fifty-nine".