99155993 has 4 divisors (see below), whose sum is σ = 99262308. Its totient is φ = 99049680.

The previous prime is 99155989. The next prime is 99156007. The reversal of 99155993 is 39955199.

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

It can be written as a sum of positive squares in 2 ways, for example, as 30382144 + 68773849 = 5512^2 + 8293^2 .

It is a cyclic number.

It is not a de Polignac number, because 99155993 - 2² = 99155989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99155933) 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, 51746 + ... + 53627.

It is an arithmetic number, because the mean of its divisors is an integer number (24815577).

Almost surely, 2^99155993 is an apocalyptic number.

It is an amenable number.

99155993 is a deficient number, since it is larger than the sum of its proper divisors (106315).

99155993 is a wasteful number, since it uses less digits than its factorization.

99155993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106314.

The product of its digits is 492075, while the sum is 50.

The square root of 99155993 is about 9957.7102287624. The cubic root of 99155993 is about 462.8493477423.

The spelling of 99155993 in words is "ninety-nine million, one hundred fifty-five thousand, nine hundred ninety-three".