99812881 has 4 divisors (see below), whose sum is σ = 114071872. Its totient is φ = 85553892.

The previous prime is 99812879. The next prime is 99812891. The reversal of 99812881 is 18821899.

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 99812881 - 2¹ = 99812879 is a prime.

It is a super-2 number, since 2×99812881² = 19925222427040322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99812821) 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, 7129485 + ... + 7129498.

It is an arithmetic number, because the mean of its divisors is an integer number (28517968).

Almost surely, 2^99812881 is an apocalyptic number.

It is an amenable number.

99812881 is a deficient number, since it is larger than the sum of its proper divisors (14258991).

99812881 is a wasteful number, since it uses less digits than its factorization.

99812881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14258990.

The product of its digits is 82944, while the sum is 46.

The square root of 99812881 is about 9990.6396692104. The cubic root of 99812881 is about 463.8691927770.

The spelling of 99812881 in words is "ninety-nine million, eight hundred twelve thousand, eight hundred eighty-one".