989636731 has 2 divisors, whose sum is σ = 989636732. Its totient is φ = 989636730.

The previous prime is 989636729. The next prime is 989636761. The reversal of 989636731 is 137636989.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 989636731 - 2¹ = 989636729 is a prime.

It is a super-2 number, since 2×989636731² = 1958761718688732722, which contains 22 as substring.

Together with 989636729, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (989636761) 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, 494818365 + 494818366.

It is an arithmetic number, because the mean of its divisors is an integer number (494818366).

Almost surely, 2^989636731 is an apocalyptic number.

989636731 is a deficient number, since it is larger than the sum of its proper divisors (1).

989636731 is an equidigital number, since it uses as much as digits as its factorization.

989636731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 52.

The square root of 989636731 is about 31458.4921920934. The cubic root of 989636731 is about 996.5335747805.

The spelling of 989636731 in words is "nine hundred eighty-nine million, six hundred thirty-six thousand, seven hundred thirty-one".