99901881 has 12 divisors (see below), whose sum is σ = 144548352. Its totient is φ = 66487896.

The previous prime is 99901859. The next prime is 99901889. The reversal of 99901881 is 18810999.

It is not a de Polignac number, because 99901881 - 2¹⁷ = 99770809 is a prime.

It is a super-2 number, since 2×99901881² = 19960771654676322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (99901889) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3681 + ... + 14606.

It is an arithmetic number, because the mean of its divisors is an integer number (12045696).

Almost surely, 2^99901881 is an apocalyptic number.

It is an amenable number.

99901881 is a deficient number, since it is larger than the sum of its proper divisors (44646471).

99901881 is a wasteful number, since it uses less digits than its factorization.

99901881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18900 (or 18897 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 45.

The square root of 99901881 is about 9995.0928459920. The cubic root of 99901881 is about 464.0070243313.

The spelling of 99901881 in words is "ninety-nine million, nine hundred one thousand, eight hundred eighty-one".