99138813 has 4 divisors (see below), whose sum is σ = 132185088. Its totient is φ = 66092540.

The previous prime is 99138797. The next prime is 99138833. The reversal of 99138813 is 31883199.

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 99138813 - 2⁴ = 99138797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99138833) 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, 16523133 + ... + 16523138.

It is an arithmetic number, because the mean of its divisors is an integer number (33046272).

Almost surely, 2^99138813 is an apocalyptic number.

It is an amenable number.

99138813 is a deficient number, since it is larger than the sum of its proper divisors (33046275).

99138813 is a wasteful number, since it uses less digits than its factorization.

99138813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33046274.

The product of its digits is 46656, while the sum is 42.

The square root of 99138813 is about 9956.8475432739. The cubic root of 99138813 is about 462.8226147437.

The spelling of 99138813 in words is "ninety-nine million, one hundred thirty-eight thousand, eight hundred thirteen".