99885971 has 4 divisors (see below), whose sum is σ = 99912744. Its totient is φ = 99859200.

The previous prime is 99885967. The next prime is 99885979. The reversal of 99885971 is 17958899.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99885971 - 2² = 99885967 is a prime.

It is a super-2 number, since 2×99885971² = 19954414405225682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99885979) 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, 6665 + ... + 15626.

It is an arithmetic number, because the mean of its divisors is an integer number (24978186).

Almost surely, 2^99885971 is an apocalyptic number.

99885971 is a deficient number, since it is larger than the sum of its proper divisors (26773).

99885971 is a wasteful number, since it uses less digits than its factorization.

99885971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26772.

The product of its digits is 1632960, while the sum is 56.

The square root of 99885971 is about 9994.2969237461. The cubic root of 99885971 is about 463.9823910157.

The spelling of 99885971 in words is "ninety-nine million, eight hundred eighty-five thousand, nine hundred seventy-one".