91943491920 has 160 divisors (see below), whose sum is σ = 325939519488. Its totient is φ = 21002955264.

The previous prime is 91943491891. The next prime is 91943491933. The reversal of 91943491920 is 2919434919.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2919297 + ... + 2950623.

Almost surely, 2^91943491920 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 91943491920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162969759744).

91943491920 is an abundant number, since it is smaller than the sum of its proper divisors (233996027568).

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

91943491920 is a wasteful number, since it uses less digits than its factorization.

91943491920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33097 (or 33091 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 51.

The spelling of 91943491920 in words is "ninety-one billion, nine hundred forty-three million, four hundred ninety-one thousand, nine hundred twenty".