99985121 has 4 divisors (see below), whose sum is σ = 102112512. Its totient is φ = 97857732.

The previous prime is 99985099. The next prime is 99985141. The reversal of 99985121 is 12158999.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 99985121 - 2⁶ = 99985057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99985141) 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, 1063625 + ... + 1063718.

It is an arithmetic number, because the mean of its divisors is an integer number (25528128).

Almost surely, 2^99985121 is an apocalyptic number.

It is an amenable number.

99985121 is a deficient number, since it is larger than the sum of its proper divisors (2127391).

99985121 is a wasteful number, since it uses less digits than its factorization.

99985121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2127390.

The product of its digits is 58320, while the sum is 44.

The square root of 99985121 is about 9999.2560223249. The cubic root of 99985121 is about 464.1358614860.

The spelling of 99985121 in words is "ninety-nine million, nine hundred eighty-five thousand, one hundred twenty-one".