91191741888 has 112 divisors (see below), whose sum is σ = 261290897280. Its totient is φ = 27902106624.

The previous prime is 91191741863. The next prime is 91191741899. The reversal of 91191741888 is 88814719119.

It is a super-2 number, since 2×91191741888² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 344731 + ... + 548837.

It is an arithmetic number, because the mean of its divisors is an integer number (2332954440).

Almost surely, 2^91191741888 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 91191741888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130645448640).

91191741888 is an abundant number, since it is smaller than the sum of its proper divisors (170099155392).

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

91191741888 is a wasteful number, since it uses less digits than its factorization.

91191741888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204314 (or 204304 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 57.

The spelling of 91191741888 in words is "ninety-one billion, one hundred ninety-one million, seven hundred forty-one thousand, eight hundred eighty-eight".