99990139 has 2 divisors, whose sum is σ = 99990140. Its totient is φ = 99990138.

The previous prime is 99990113. The next prime is 99990161. The reversal of 99990139 is 93109999.

It is a strong prime.

It is an emirp because it is prime and its reverse (93109999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99990139 - 2⁹ = 99989627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99990092 and 99990101.

It is not a weakly prime, because it can be changed into another prime (99990239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49995069 + 49995070.

It is an arithmetic number, because the mean of its divisors is an integer number (49995070).

Almost surely, 2^99990139 is an apocalyptic number.

99990139 is a deficient number, since it is larger than the sum of its proper divisors (1).

99990139 is an equidigital number, since it uses as much as digits as its factorization.

99990139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 177147, while the sum is 49.

The square root of 99990139 is about 9999.5069378445. The cubic root of 99990139 is about 464.1436259573.

The spelling of 99990139 in words is "ninety-nine million, nine hundred ninety thousand, one hundred thirty-nine".