91164540 has 96 divisors (see below), whose sum is σ = 272643840. Its totient is φ = 22680576.

The previous prime is 91164539. The next prime is 91164551. The reversal of 91164540 is 4546119.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 91164498 and 91164507.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 141459 + ... + 142101.

It is an arithmetic number, because the mean of its divisors is an integer number (2840040).

Almost surely, 2^91164540 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 91164540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136321920).

91164540 is an abundant number, since it is smaller than the sum of its proper divisors (181479300).

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

91164540 is a wasteful number, since it uses less digits than its factorization.

91164540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811 (or 809 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 91164540 is about 9548.0123586011. The cubic root of 91164540 is about 450.0650770082.

The spelling of 91164540 in words is "ninety-one million, one hundred sixty-four thousand, five hundred forty".