91565247 has 16 divisors (see below), whose sum is σ = 130727520. Its totient is φ = 56804352.

The previous prime is 91565233. The next prime is 91565251. The reversal of 91565247 is 74256519.

It is not a de Polignac number, because 91565247 - 2¹⁸ = 91303103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91565207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5548 + ... + 14625.

It is an arithmetic number, because the mean of its divisors is an integer number (8170470).

Almost surely, 2^91565247 is an apocalyptic number.

91565247 is a deficient number, since it is larger than the sum of its proper divisors (39162273).

91565247 is a wasteful number, since it uses less digits than its factorization.

91565247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20282.

The product of its digits is 75600, while the sum is 39.

The square root of 91565247 is about 9568.9731424014. The cubic root of 91565247 is about 450.7235224967.

The spelling of 91565247 in words is "ninety-one million, five hundred sixty-five thousand, two hundred forty-seven".