91998307473 has 16 divisors (see below), whose sum is σ = 124764656640. Its totient is φ = 60282435024.

The previous prime is 91998307411. The next prime is 91998307481. The reversal of 91998307473 is 37470389919.

It is a happy number.

It is not a de Polignac number, because 91998307473 - 2⁶ = 91998307409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91998307573) 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 15 ways as a sum of consecutive naturals, for example, 1081740 + ... + 1163682.

It is an arithmetic number, because the mean of its divisors is an integer number (7797791040).

Almost surely, 2^91998307473 is an apocalyptic number.

It is an amenable number.

91998307473 is a deficient number, since it is larger than the sum of its proper divisors (32766349167).

91998307473 is a wasteful number, since it uses less digits than its factorization.

91998307473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88348.

The product of its (nonzero) digits is 10287648, while the sum is 60.

The spelling of 91998307473 in words is "ninety-one billion, nine hundred ninety-eight million, three hundred seven thousand, four hundred seventy-three".