91895663 has 4 divisors (see below), whose sum is σ = 92160840. Its totient is φ = 91630488.

The previous prime is 91895653. The next prime is 91895677. The reversal of 91895663 is 36659819.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91895663 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 (91895623) 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, 132068 + ... + 132761.

It is an arithmetic number, because the mean of its divisors is an integer number (23040210).

Almost surely, 2^91895663 is an apocalyptic number.

91895663 is a deficient number, since it is larger than the sum of its proper divisors (265177).

91895663 is a wasteful number, since it uses less digits than its factorization.

91895663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265176.

The product of its digits is 349920, while the sum is 47.

The square root of 91895663 is about 9586.2225615724. Note that the first 3 decimals coincide. The cubic root of 91895663 is about 451.2650215609.

The spelling of 91895663 in words is "ninety-one million, eight hundred ninety-five thousand, six hundred sixty-three".