99999813 has 8 divisors (see below), whose sum is σ = 133826176. Its totient is φ = 66420000.

The previous prime is 99999787. The next prime is 99999821. The reversal of 99999813 is 31899999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 99999813 - 2²² = 95805509 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 (99999113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60688 + ... + 62313.

It is an arithmetic number, because the mean of its divisors is an integer number (16728272).

Almost surely, 2^99999813 is an apocalyptic number.

It is an amenable number.

99999813 is a deficient number, since it is larger than the sum of its proper divisors (33826363).

99999813 is a wasteful number, since it uses less digits than its factorization.

99999813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123275.

The product of its digits is 1417176, while the sum is 57.

The square root of 99999813 is about 9999.9906499956. The cubic root of 99999813 is about 464.1585940354.

The spelling of 99999813 in words is "ninety-nine million, nine hundred ninety-nine thousand, eight hundred thirteen".