91905491436 has 192 divisors, whose sum is σ = 251414102016. Its totient is φ = 26067581760.

The previous prime is 91905491357. The next prime is 91905491497. The reversal of 91905491436 is 63419450919.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17263071 + ... + 17268393.

It is an arithmetic number, because the mean of its divisors is an integer number (1309448448).

Almost surely, 2^91905491436 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 91905491436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125707051008).

91905491436 is an abundant number, since it is smaller than the sum of its proper divisors (159508610580).

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

91905491436 is a wasteful number, since it uses less digits than its factorization.

91905491436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5433 (or 5409 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 51.

The spelling of 91905491436 in words is "ninety-one billion, nine hundred five million, four hundred ninety-one thousand, four hundred thirty-six".