99813139 has 2 divisors, whose sum is σ = 99813140. Its totient is φ = 99813138.

The previous prime is 99813127. The next prime is 99813193. The reversal of 99813139 is 93131899.

Together with next prime (99813193) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99813139 - 2⁵ = 99813107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99813095 and 99813104.

It is not a weakly prime, because it can be changed into another prime (99813739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49906569 + 49906570.

It is an arithmetic number, because the mean of its divisors is an integer number (49906570).

Almost surely, 2^99813139 is an apocalyptic number.

99813139 is a deficient number, since it is larger than the sum of its proper divisors (1).

99813139 is an equidigital number, since it uses as much as digits as its factorization.

99813139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488, while the sum is 43.

The square root of 99813139 is about 9990.6525812882. The cubic root of 99813139 is about 463.8695924521.

The spelling of 99813139 in words is "ninety-nine million, eight hundred thirteen thousand, one hundred thirty-nine".