91939321848 has 128 divisors (see below), whose sum is σ = 256617123840. Its totient is φ = 27210288000.

The previous prime is 91939321823. The next prime is 91939321849. The reversal of 91939321848 is 84812393919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91939321849) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6084783 + ... + 6099873.

It is an arithmetic number, because the mean of its divisors is an integer number (2004821280).

Almost surely, 2^91939321848 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91939321848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128308561920).

91939321848 is an abundant number, since it is smaller than the sum of its proper divisors (164677801992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91939321848 is a wasteful number, since it uses less digits than its factorization.

91939321848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15649 (or 15645 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 57.

The spelling of 91939321848 in words is "ninety-one billion, nine hundred thirty-nine million, three hundred twenty-one thousand, eight hundred forty-eight".