91316247 has 16 divisors (see below), whose sum is σ = 135077760. Its totient is φ = 54404000.

The previous prime is 91316177. The next prime is 91316249. The reversal of 91316247 is 74261319.

It is a cyclic number.

It is not a de Polignac number, because 91316247 - 2⁷ = 91316119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91316249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21504 + ... + 25397.

It is an arithmetic number, because the mean of its divisors is an integer number (8442360).

Almost surely, 2^91316247 is an apocalyptic number.

91316247 is a deficient number, since it is larger than the sum of its proper divisors (43761513).

91316247 is a wasteful number, since it uses less digits than its factorization.

91316247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46974.

The product of its digits is 9072, while the sum is 33.

The square root of 91316247 is about 9555.9534846084. The cubic root of 91316247 is about 450.3145898991.

The spelling of 91316247 in words is "ninety-one million, three hundred sixteen thousand, two hundred forty-seven".