99779599 has 2 divisors, whose sum is σ = 99779600. Its totient is φ = 99779598.

The previous prime is 99779597. The next prime is 99779611. The reversal of 99779599 is 99597799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99779599 - 2¹ = 99779597 is a prime.

Together with 99779597, 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 99779599.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99779597) 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, 49889799 + 49889800.

It is an arithmetic number, because the mean of its divisors is an integer number (49889800).

Almost surely, 2^99779599 is an apocalyptic number.

99779599 is a deficient number, since it is larger than the sum of its proper divisors (1).

99779599 is an equidigital number, since it uses as much as digits as its factorization.

99779599 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14467005, while the sum is 64.

The square root of 99779599 is about 9988.9738712242. The cubic root of 99779599 is about 463.8176289221.

The spelling of 99779599 in words is "ninety-nine million, seven hundred seventy-nine thousand, five hundred ninety-nine".