99981015 has 16 divisors (see below), whose sum is σ = 160679808. Its totient is φ = 53086496.

The previous prime is 99980981. The next prime is 99981041. The reversal of 99981015 is 51018999.

It is a cyclic number.

It is not a de Polignac number, because 99981015 - 2⁸ = 99980759 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11277 + ... + 18086.

It is an arithmetic number, because the mean of its divisors is an integer number (10042488).

Almost surely, 2^99981015 is an apocalyptic number.

99981015 is a deficient number, since it is larger than the sum of its proper divisors (60698793).

99981015 is a wasteful number, since it uses less digits than its factorization.

99981015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29598.

The product of its (nonzero) digits is 29160, while the sum is 42.

The square root of 99981015 is about 9999.0507049419. The cubic root of 99981015 is about 464.1295079809.

The spelling of 99981015 in words is "ninety-nine million, nine hundred eighty-one thousand, fifteen".