91477899 has 12 divisors (see below), whose sum is σ = 135208216. Its totient is φ = 59566752.

The previous prime is 91477879. The next prime is 91477909. The reversal of 91477899 is 99877419.

91477899 is a `hidden beast` number, since 91 + 477 + 89 + 9 = 666.

It is not a de Polignac number, because 91477899 - 2¹² = 91473803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91477829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117802 + ... + 118575.

Almost surely, 2^91477899 is an apocalyptic number.

91477899 is a deficient number, since it is larger than the sum of its proper divisors (43730317).

91477899 is a wasteful number, since it uses less digits than its factorization.

91477899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236426 (or 236423 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The square root of 91477899 is about 9564.4079273105. The cubic root of 91477899 is about 450.5801554260.

The spelling of 91477899 in words is "ninety-one million, four hundred seventy-seven thousand, eight hundred ninety-nine".