91061012 has 48 divisors (see below), whose sum is σ = 191923200. Its totient is φ = 37749600.

The previous prime is 91060999. The next prime is 91061039. The reversal of 91061012 is 21016019.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41462 + ... + 43602.

It is an arithmetic number, because the mean of its divisors is an integer number (3998400).

Almost surely, 2^91061012 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 91061012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95961600).

91061012 is an abundant number, since it is smaller than the sum of its proper divisors (100862188).

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

91061012 is a wasteful number, since it uses less digits than its factorization.

91061012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2197 (or 2181 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 91061012 is about 9542.5893760551. The cubic root of 91061012 is about 449.8946452950.

The spelling of 91061012 in words is "ninety-one million, sixty-one thousand, twelve".