99091979 has 4 divisors (see below), whose sum is σ = 113247984. Its totient is φ = 84935976.

The previous prime is 99091969. The next prime is 99092023. The reversal of 99091979 is 97919099.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99091979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99091979.

It is not an unprimeable number, because it can be changed into a prime (99091939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7077992 + ... + 7078005.

It is an arithmetic number, because the mean of its divisors is an integer number (28311996).

Almost surely, 2^99091979 is an apocalyptic number.

99091979 is a deficient number, since it is larger than the sum of its proper divisors (14156005).

99091979 is a wasteful number, since it uses less digits than its factorization.

99091979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14156004.

The product of its (nonzero) digits is 413343, while the sum is 53.

The square root of 99091979 is about 9954.4954166447. The cubic root of 99091979 is about 462.7497228464.

The spelling of 99091979 in words is "ninety-nine million, ninety-one thousand, nine hundred seventy-nine".