99919117 has 2 divisors, whose sum is σ = 99919118. Its totient is φ = 99919116.

The previous prime is 99919111. The next prime is 99919139. The reversal of 99919117 is 71191999.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96255721 + 3663396 = 9811^2 + 1914^2 .

It is an emirp because it is prime and its reverse (71191999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99919117 - 2⁷ = 99918989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99919111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49959558 + 49959559.

It is an arithmetic number, because the mean of its divisors is an integer number (49959559).

Almost surely, 2^99919117 is an apocalyptic number.

It is an amenable number.

99919117 is a deficient number, since it is larger than the sum of its proper divisors (1).

99919117 is an equidigital number, since it uses as much as digits as its factorization.

99919117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45927, while the sum is 46.

The square root of 99919117 is about 9995.9550319117. The cubic root of 99919117 is about 464.0337077301.

The spelling of 99919117 in words is "ninety-nine million, nine hundred nineteen thousand, one hundred seventeen".