99218081 has 4 divisors (see below), whose sum is σ = 101329152. Its totient is φ = 97107012.

The previous prime is 99218059. The next prime is 99218111. The reversal of 99218081 is 18081299.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18081299 = 149 ⋅121351.

It is a cyclic number.

It is not a de Polignac number, because 99218081 - 2²² = 95023777 is a prime.

It is a super-2 number, since 2×99218081² = 19688455194645122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99218051) 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, 1055465 + ... + 1055558.

It is an arithmetic number, because the mean of its divisors is an integer number (25332288).

Almost surely, 2^99218081 is an apocalyptic number.

It is an amenable number.

99218081 is a deficient number, since it is larger than the sum of its proper divisors (2111071).

99218081 is a wasteful number, since it uses less digits than its factorization.

99218081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111070.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 99218081 is about 9960.8273250770. The cubic root of 99218081 is about 462.9459342535.

The spelling of 99218081 in words is "ninety-nine million, two hundred eighteen thousand, eighty-one".