91299979 has 12 divisors (see below), whose sum is σ = 99379224. Its totient is φ = 83585664.

The previous prime is 91299961. The next prime is 91299983. The reversal of 91299979 is 97999219.

It is not a de Polignac number, because 91299979 - 2⁷ = 91299851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91299079) 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 11 ways as a sum of consecutive naturals, for example, 21312 + ... + 25234.

It is an arithmetic number, because the mean of its divisors is an integer number (8281602).

Almost surely, 2^91299979 is an apocalyptic number.

91299979 is a deficient number, since it is larger than the sum of its proper divisors (8079245).

91299979 is a wasteful number, since it uses less digits than its factorization.

91299979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4014 (or 3977 counting only the distinct ones).

The product of its digits is 826686, while the sum is 55.

The square root of 91299979 is about 9555.1022495837. The cubic root of 91299979 is about 450.2878471121.

The spelling of 91299979 in words is "ninety-one million, two hundred ninety-nine thousand, nine hundred seventy-nine".