969998639 has 2 divisors, whose sum is σ = 969998640. Its totient is φ = 969998638.

The previous prime is 969998611. The next prime is 969998651. The reversal of 969998639 is 936899969.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 969998639 - 2⁸ = 969998383 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (969998609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 484999319 + 484999320.

It is an arithmetic number, because the mean of its divisors is an integer number (484999320).

Almost surely, 2^969998639 is an apocalyptic number.

969998639 is a deficient number, since it is larger than the sum of its proper divisors (1).

969998639 is an equidigital number, since it uses as much as digits as its factorization.

969998639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51018336, while the sum is 68.

The square root of 969998639 is about 31144.8011552490. The cubic root of 969998639 is about 989.8978362759.

The spelling of 969998639 in words is "nine hundred sixty-nine million, nine hundred ninety-eight thousand, six hundred thirty-nine".