988639669 has 2 divisors, whose sum is σ = 988639670. Its totient is φ = 988639668.

The previous prime is 988639651. The next prime is 988639697. The reversal of 988639669 is 966936889.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 594140625 + 394499044 = 24375^2 + 19862^2 .

It is an emirp because it is prime and its reverse (966936889) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 988639669 - 2⁵ = 988639637 is a prime.

It is a super-2 number, since 2×988639669² = 1954816790240859122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 988639669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (988639649) 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, 494319834 + 494319835.

It is an arithmetic number, because the mean of its divisors is an integer number (494319835).

Almost surely, 2^988639669 is an apocalyptic number.

It is an amenable number.

988639669 is a deficient number, since it is larger than the sum of its proper divisors (1).

988639669 is an equidigital number, since it uses as much as digits as its factorization.

988639669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30233088, while the sum is 64.

The square root of 988639669 is about 31442.6409355194. The cubic root of 988639669 is about 996.1987921268.

The spelling of 988639669 in words is "nine hundred eighty-eight million, six hundred thirty-nine thousand, six hundred sixty-nine".