999910139 has 2 divisors, whose sum is σ = 999910140. Its totient is φ = 999910138.

The previous prime is 999910133. The next prime is 999910147. The reversal of 999910139 is 931019999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999910139 - 2²⁴ = 983132923 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999910133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499955069 + 499955070.

It is an arithmetic number, because the mean of its divisors is an integer number (499955070).

Almost surely, 2^999910139 is an apocalyptic number.

999910139 is a deficient number, since it is larger than the sum of its proper divisors (1).

999910139 is an equidigital number, since it uses as much as digits as its factorization.

999910139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 177147, while the sum is 50.

The square root of 999910139 is about 31621.3557425990. The cubic root of 999910139 is about 999.9700454361.

The spelling of 999910139 in words is "nine hundred ninety-nine million, nine hundred ten thousand, one hundred thirty-nine".