91387929899 has 8 divisors (see below), whose sum is σ = 104446219488. Its totient is φ = 78330358080.

The previous prime is 91387929869. The next prime is 91387929907. The reversal of 91387929899 is 99892978319.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91387929899 - 2⁸ = 91387929643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91387929869) 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 7 ways as a sum of consecutive naturals, for example, 128669 + ... + 446465.

It is an arithmetic number, because the mean of its divisors is an integer number (13055777436).

Almost surely, 2^91387929899 is an apocalyptic number.

91387929899 is a deficient number, since it is larger than the sum of its proper divisors (13058289589).

91387929899 is a wasteful number, since it uses less digits than its factorization.

91387929899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358885.

The product of its digits is 158723712, while the sum is 74.

The spelling of 91387929899 in words is "ninety-one billion, three hundred eighty-seven million, nine hundred twenty-nine thousand, eight hundred ninety-nine".