91495871 has 4 divisors (see below), whose sum is σ = 91515312. Its totient is φ = 91476432.

The previous prime is 91495867. The next prime is 91495879. The reversal of 91495871 is 17859419.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17859419 = 37 ⋅482687.

It is a cyclic number.

It is not a de Polignac number, because 91495871 - 2² = 91495867 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 (91495879) 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 3 ways as a sum of consecutive naturals, for example, 2270 + ... + 13716.

It is an arithmetic number, because the mean of its divisors is an integer number (22878828).

Almost surely, 2^91495871 is an apocalyptic number.

91495871 is a deficient number, since it is larger than the sum of its proper divisors (19441).

91495871 is a wasteful number, since it uses less digits than its factorization.

91495871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19440.

The product of its digits is 90720, while the sum is 44.

The square root of 91495871 is about 9565.3474061322. The cubic root of 91495871 is about 450.6096609000.

The spelling of 91495871 in words is "ninety-one million, four hundred ninety-five thousand, eight hundred seventy-one".