91717287 has 16 divisors (see below), whose sum is σ = 126440160. Its totient is φ = 59097600.

The previous prime is 91717271. The next prime is 91717319. The reversal of 91717287 is 78271719.

It is not a de Polignac number, because 91717287 - 2⁴ = 91717271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91717207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9987 + ... + 16827.

It is an arithmetic number, because the mean of its divisors is an integer number (7902510).

Almost surely, 2^91717287 is an apocalyptic number.

91717287 is a deficient number, since it is larger than the sum of its proper divisors (34722873).

91717287 is a wasteful number, since it uses less digits than its factorization.

91717287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6994.

The product of its digits is 49392, while the sum is 42.

The square root of 91717287 is about 9576.9142733973. The cubic root of 91717287 is about 450.9728533012.

The spelling of 91717287 in words is "ninety-one million, seven hundred seventeen thousand, two hundred eighty-seven".