99515989 has 2 divisors, whose sum is σ = 99515990. Its totient is φ = 99515988.

The previous prime is 99515953. The next prime is 99516013. The reversal of 99515989 is 98951599.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84824100 + 14691889 = 9210^2 + 3833^2 .

It is an emirp because it is prime and its reverse (98951599) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99515989 - 2⁷ = 99515861 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99515189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49757994 + 49757995.

It is an arithmetic number, because the mean of its divisors is an integer number (49757995).

Almost surely, 2^99515989 is an apocalyptic number.

It is an amenable number.

99515989 is a deficient number, since it is larger than the sum of its proper divisors (1).

99515989 is an equidigital number, since it uses as much as digits as its factorization.

99515989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1312200, while the sum is 55.

The square root of 99515989 is about 9975.7700955866. The cubic root of 99515989 is about 463.4088118961.

The spelling of 99515989 in words is "ninety-nine million, five hundred fifteen thousand, nine hundred eighty-nine".