91450865 has 16 divisors (see below), whose sum is σ = 122955840. Its totient is φ = 64710720.

The previous prime is 91450859. The next prime is 91450889. The reversal of 91450865 is 56805419.

It is not a de Polignac number, because 91450865 - 2²⁰ = 90402289 is a prime.

It is an unprimeable number.

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, 20435 + ... + 24504.

It is an arithmetic number, because the mean of its divisors is an integer number (7684740).

Almost surely, 2^91450865 is an apocalyptic number.

It is an amenable number.

91450865 is a deficient number, since it is larger than the sum of its proper divisors (31504975).

91450865 is a wasteful number, since it uses less digits than its factorization.

91450865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44992.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 91450865 is about 9562.9945623743. The cubic root of 91450865 is about 450.5357651628.

The spelling of 91450865 in words is "ninety-one million, four hundred fifty thousand, eight hundred sixty-five".