91288847 has 4 divisors (see below), whose sum is σ = 98311080. Its totient is φ = 84266616.

The previous prime is 91288819. The next prime is 91288859. The reversal of 91288847 is 74888219.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91288847 - 2⁶ = 91288783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91288867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3511097 + ... + 3511122.

It is an arithmetic number, because the mean of its divisors is an integer number (24577770).

Almost surely, 2^91288847 is an apocalyptic number.

91288847 is a deficient number, since it is larger than the sum of its proper divisors (7022233).

91288847 is a wasteful number, since it uses less digits than its factorization.

91288847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7022232.

The product of its digits is 258048, while the sum is 47.

The square root of 91288847 is about 9554.5197158204. The cubic root of 91288847 is about 450.2695455086.

The spelling of 91288847 in words is "ninety-one million, two hundred eighty-eight thousand, eight hundred forty-seven".