99139 has 2 divisors, whose sum is σ = 99140. Its totient is φ = 99138.

The previous prime is 99137. The next prime is 99149. The reversal of 99139 is 93199.

It is a weak prime.

It is an emirp because it is prime and its reverse (93199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99139 - 2¹ = 99137 is a prime.

Together with 99137, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 99139.

It is not a weakly prime, because it can be changed into another prime (99131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49569 + 49570.

It is an arithmetic number, because the mean of its divisors is an integer number (49570).

2⁹⁹¹³⁹ is an apocalyptic number.

99139 is a deficient number, since it is larger than the sum of its proper divisors (1).

99139 is an equidigital number, since it uses as much as digits as its factorization.

99139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2187, while the sum is 31.

The square root of 99139 is about 314.8634624722. The cubic root of 99139 is about 46.2822905742.

The spelling of 99139 in words is "ninety-nine thousand, one hundred thirty-nine".