99688643 has 2 divisors, whose sum is σ = 99688644. Its totient is φ = 99688642.

The previous prime is 99688627. The next prime is 99688651. The reversal of 99688643 is 34688699.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99688643 - 2⁴ = 99688627 is a prime.

It is not a weakly prime, because it can be changed into another prime (99688613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49844321 + 49844322.

It is an arithmetic number, because the mean of its divisors is an integer number (49844322).

Almost surely, 2^99688643 is an apocalyptic number.

99688643 is a deficient number, since it is larger than the sum of its proper divisors (1).

99688643 is an equidigital number, since it uses as much as digits as its factorization.

99688643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2239488, while the sum is 53.

The square root of 99688643 is about 9984.4200132006. The cubic root of 99688643 is about 463.6766521361.

The spelling of 99688643 in words is "ninety-nine million, six hundred eighty-eight thousand, six hundred forty-three".