91216548 has 36 divisors (see below), whose sum is σ = 231039900. Its totient is φ = 30344256.

The previous prime is 91216523. The next prime is 91216591. The reversal of 91216548 is 84561219.

91216548 is a `hidden beast` number, since 91 + 21 + 6 + 548 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 34786404 + 56430144 = 5898^2 + 7512^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17778 + ... + 22326.

It is an arithmetic number, because the mean of its divisors is an integer number (6417775).

Almost surely, 2^91216548 is an apocalyptic number.

It is an amenable number.

91216548 is an abundant number, since it is smaller than the sum of its proper divisors (139823352).

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

91216548 is a wasteful number, since it uses less digits than its factorization.

91216548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5116 (or 5111 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 91216548 is about 9550.7354690621. The cubic root of 91216548 is about 450.1506458592.

The spelling of 91216548 in words is "ninety-one million, two hundred sixteen thousand, five hundred forty-eight".