99801139 has 2 divisors, whose sum is σ = 99801140. Its totient is φ = 99801138.

The previous prime is 99801131. The next prime is 99801179. The reversal of 99801139 is 93110899.

It is an a-pointer prime, because the next prime (99801179) can be obtained adding 99801139 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99801139 - 2³ = 99801131 is a prime.

It is not a weakly prime, because it can be changed into another prime (99801131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49900569 + 49900570.

It is an arithmetic number, because the mean of its divisors is an integer number (49900570).

Almost surely, 2^99801139 is an apocalyptic number.

99801139 is a deficient number, since it is larger than the sum of its proper divisors (1).

99801139 is an equidigital number, since it uses as much as digits as its factorization.

99801139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 40.

The square root of 99801139 is about 9990.0520018667. The cubic root of 99801139 is about 463.8510021868.

The spelling of 99801139 in words is "ninety-nine million, eight hundred one thousand, one hundred thirty-nine".