99912139 has 2 divisors, whose sum is σ = 99912140. Its totient is φ = 99912138.

The previous prime is 99912097. The next prime is 99912149. The reversal of 99912139 is 93121999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99912139 - 2⁹ = 99911627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99912095 and 99912104.

It is not a weakly prime, because it can be changed into another prime (99912149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49956069 + 49956070.

It is an arithmetic number, because the mean of its divisors is an integer number (49956070).

Almost surely, 2^99912139 is an apocalyptic number.

99912139 is a deficient number, since it is larger than the sum of its proper divisors (1).

99912139 is an equidigital number, since it uses as much as digits as its factorization.

99912139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39366, while the sum is 43.

The square root of 99912139 is about 9995.6059846314. The cubic root of 99912139 is about 464.0229053174.

The spelling of 99912139 in words is "ninety-nine million, nine hundred twelve thousand, one hundred thirty-nine".