91939321850 has 24 divisors (see below), whose sum is σ = 171081350688. Its totient is φ = 36759769200.

The previous prime is 91939321849. The next prime is 91939321871. The reversal of 91939321850 is 5812393919.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 282284 + ... + 513383.

It is an arithmetic number, because the mean of its divisors is an integer number (7128389612).

Almost surely, 2^91939321850 is an apocalyptic number.

91939321850 is a deficient number, since it is larger than the sum of its proper divisors (79142028838).

91939321850 is a wasteful number, since it uses less digits than its factorization.

91939321850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797990 (or 797985 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 50.

The spelling of 91939321850 in words is "ninety-one billion, nine hundred thirty-nine million, three hundred twenty-one thousand, eight hundred fifty".