91596865 has 4 divisors (see below), whose sum is σ = 109916244. Its totient is φ = 73277488.

The previous prime is 91596863. The next prime is 91596871. The reversal of 91596865 is 56869519.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56869519 = 7 ⋅8124217.

It can be written as a sum of positive squares in 2 ways, for example, as 12173121 + 79423744 = 3489^2 + 8912^2 .

It is a cyclic number.

It is not a de Polignac number, because 91596865 - 2¹ = 91596863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91596863) 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, 9159682 + ... + 9159691.

It is an arithmetic number, because the mean of its divisors is an integer number (27479061).

Almost surely, 2^91596865 is an apocalyptic number.

It is an amenable number.

91596865 is a deficient number, since it is larger than the sum of its proper divisors (18319379).

91596865 is a wasteful number, since it uses less digits than its factorization.

91596865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18319378.

The product of its digits is 583200, while the sum is 49.

The square root of 91596865 is about 9570.6251102005. The cubic root of 91596865 is about 450.7753956575.

The spelling of 91596865 in words is "ninety-one million, five hundred ninety-six thousand, eight hundred sixty-five".