99660091 has 4 divisors (see below), whose sum is σ = 99946000. Its totient is φ = 99374184.

The previous prime is 99660079. The next prime is 99660097. The reversal of 99660091 is 19006699.

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 99660091 - 2¹³ = 99651899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99660097) 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, 142431 + ... + 143128.

It is an arithmetic number, because the mean of its divisors is an integer number (24986500).

Almost surely, 2^99660091 is an apocalyptic number.

99660091 is a deficient number, since it is larger than the sum of its proper divisors (285909).

99660091 is a wasteful number, since it uses less digits than its factorization.

99660091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285908.

The product of its (nonzero) digits is 26244, while the sum is 40.

The square root of 99660091 is about 9982.9900831364. The cubic root of 99660091 is about 463.6323804267.

The spelling of 99660091 in words is "ninety-nine million, six hundred sixty thousand, ninety-one".