91191250612 has 96 divisors (see below), whose sum is σ = 202330275840. Its totient is φ = 34931520000.

The previous prime is 91191250573. The next prime is 91191250613. The reversal of 91191250612 is 21605219119.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91191250613) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 5856237 + ... + 5871787.

It is an arithmetic number, because the mean of its divisors is an integer number (2107607040).

Almost surely, 2^91191250612 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 91191250612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101165137920).

91191250612 is an abundant number, since it is smaller than the sum of its proper divisors (111139025228).

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

91191250612 is a wasteful number, since it uses less digits than its factorization.

91191250612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15893 (or 15891 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 37.

The spelling of 91191250612 in words is "ninety-one billion, one hundred ninety-one million, two hundred fifty thousand, six hundred twelve".