99121785 has 16 divisors (see below), whose sum is σ = 181251456. Its totient is φ = 45312768.

The previous prime is 99121783. The next prime is 99121801. The reversal of 99121785 is 58712199.

It is not a de Polignac number, because 99121785 - 2¹ = 99121783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99121783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 471904 + ... + 472113.

It is an arithmetic number, because the mean of its divisors is an integer number (11328216).

Almost surely, 2^99121785 is an apocalyptic number.

It is an amenable number.

99121785 is a deficient number, since it is larger than the sum of its proper divisors (82129671).

99121785 is a wasteful number, since it uses less digits than its factorization.

99121785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 944032.

The product of its digits is 45360, while the sum is 42.

The square root of 99121785 is about 9955.9924166303. The cubic root of 99121785 is about 462.7961152174.

The spelling of 99121785 in words is "ninety-nine million, one hundred twenty-one thousand, seven hundred eighty-five".