91517472 has 96 divisors (see below), whose sum is σ = 270768960. Its totient is φ = 30067200.

The previous prime is 91517441. The next prime is 91517473. The reversal of 91517472 is 27471519.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

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

It is not an unprimeable number, because it can be changed into a prime (91517473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62347 + ... + 63797.

It is an arithmetic number, because the mean of its divisors is an integer number (2820510).

Almost surely, 2^91517472 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 91517472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135384480).

91517472 is an abundant number, since it is smaller than the sum of its proper divisors (179251488).

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

91517472 is a wasteful number, since it uses less digits than its factorization.

91517472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1543 (or 1529 counting only the distinct ones).

The product of its digits is 17640, while the sum is 36.

The square root of 91517472 is about 9566.4764673311. The cubic root of 91517472 is about 450.6451191609.

The spelling of 91517472 in words is "ninety-one million, five hundred seventeen thousand, four hundred seventy-two".