91445216 has 12 divisors (see below), whose sum is σ = 180032832. Its totient is φ = 45722592.

The previous prime is 91445213. The next prime is 91445239. The reversal of 91445216 is 61254419.

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 2857663 = 91445216 / (9 + 1 + 4 + 4 + 5 + 2 + 1 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91445213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1428800 + ... + 1428863.

It is an arithmetic number, because the mean of its divisors is an integer number (15002736).

Almost surely, 2^91445216 is an apocalyptic number.

It is an amenable number.

91445216 is a deficient number, since it is larger than the sum of its proper divisors (88587616).

91445216 is a wasteful number, since it uses less digits than its factorization.

91445216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2857673 (or 2857665 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 91445216 is about 9562.6992005396. The cubic root of 91445216 is about 450.5264883089.

The spelling of 91445216 in words is "ninety-one million, four hundred forty-five thousand, two hundred sixteen".