99120861 has 32 divisors (see below), whose sum is σ = 168320000. Its totient is φ = 56473200.

The previous prime is 99120859. The next prime is 99120871. The reversal of 99120861 is 16802199.

It is not a de Polignac number, because 99120861 - 2¹ = 99120859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99120871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 93786 + ... + 94836.

It is an arithmetic number, because the mean of its divisors is an integer number (5260000).

Almost surely, 2^99120861 is an apocalyptic number.

It is an amenable number.

99120861 is a deficient number, since it is larger than the sum of its proper divisors (69199139).

99120861 is a wasteful number, since it uses less digits than its factorization.

99120861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1566 (or 1560 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 99120861 is about 9955.9460123084. The cubic root of 99120861 is about 462.7946771718.

The spelling of 99120861 in words is "ninety-nine million, one hundred twenty thousand, eight hundred sixty-one".