99919969 has 2 divisors, whose sum is σ = 99919970. Its totient is φ = 99919968.

The previous prime is 99919961. The next prime is 99919997. The reversal of 99919969 is 96991999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86266944 + 13653025 = 9288^2 + 3695^2 .

It is a cyclic number.

It is not a de Polignac number, because 99919969 - 2³ = 99919961 is a prime.

It is a super-2 number, since 2×99919969² = 19968000409921922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (99919961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49959984 + 49959985.

It is an arithmetic number, because the mean of its divisors is an integer number (49959985).

Almost surely, 2^99919969 is an apocalyptic number.

It is an amenable number.

99919969 is a deficient number, since it is larger than the sum of its proper divisors (1).

99919969 is an equidigital number, since it uses as much as digits as its factorization.

99919969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3188646, while the sum is 61.

The square root of 99919969 is about 9995.9976490593. The cubic root of 99919969 is about 464.0350266488.

The spelling of 99919969 in words is "ninety-nine million, nine hundred nineteen thousand, nine hundred sixty-nine".