99818681 has 4 divisors (see below), whose sum is σ = 99851664. Its totient is φ = 99785700.

The previous prime is 99818659. The next prime is 99818717. The reversal of 99818681 is 18681899.

It is a happy number.

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 99818681 - 2⁶ = 99818617 is a prime.

It is a super-2 number, since 2×99818681² = 19927538153159522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99818651) 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, 11435 + ... + 18176.

It is an arithmetic number, because the mean of its divisors is an integer number (24962916).

Almost surely, 2^99818681 is an apocalyptic number.

It is an amenable number.

99818681 is a deficient number, since it is larger than the sum of its proper divisors (32983).

99818681 is a wasteful number, since it uses less digits than its factorization.

99818681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32982.

The product of its digits is 248832, while the sum is 50.

The square root of 99818681 is about 9990.9299366976. The cubic root of 99818681 is about 463.8781775533.

The spelling of 99818681 in words is "ninety-nine million, eight hundred eighteen thousand, six hundred eighty-one".