99818989 has 4 divisors (see below), whose sum is σ = 105072640. Its totient is φ = 94565340.

The previous prime is 99818941. The next prime is 99818993. The reversal of 99818989 is 98981899.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 99818989 - 2⁷ = 99818861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99818189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2626797 + ... + 2626834.

It is an arithmetic number, because the mean of its divisors is an integer number (26268160).

Almost surely, 2^99818989 is an apocalyptic number.

It is an amenable number.

99818989 is a deficient number, since it is larger than the sum of its proper divisors (5253651).

99818989 is a wasteful number, since it uses less digits than its factorization.

99818989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5253650.

The product of its digits is 3359232, while the sum is 61.

The square root of 99818989 is about 9990.9453506663. The cubic root of 99818989 is about 463.8786546662.

The spelling of 99818989 in words is "ninety-nine million, eight hundred eighteen thousand, nine hundred eighty-nine".