91018319112 has 768 divisors, whose sum is σ = 324979200000. Its totient is φ = 23279477760.

The previous prime is 91018319101. The next prime is 91018319153. The reversal of 91018319112 is 21191381019.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 457378389 + ... + 457378587.

It is an arithmetic number, because the mean of its divisors is an integer number (423150000).

Almost surely, 2^91018319112 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 91018319112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162489600000).

91018319112 is an abundant number, since it is smaller than the sum of its proper divisors (233960880888).

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

91018319112 is a wasteful number, since it uses less digits than its factorization.

91018319112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336 (or 320 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 36.

The spelling of 91018319112 in words is "ninety-one billion, eighteen million, three hundred nineteen thousand, one hundred twelve".