91911663 has 12 divisors (see below), whose sum is σ = 136349928. Its totient is φ = 59618160.

The previous prime is 91911653. The next prime is 91911691. The reversal of 91911663 is 36611919.

It is not a de Polignac number, because 91911663 - 2¹⁶ = 91846127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91911653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 137673 + ... + 138338.

It is an arithmetic number, because the mean of its divisors is an integer number (11362494).

Almost surely, 2^91911663 is an apocalyptic number.

91911663 is a deficient number, since it is larger than the sum of its proper divisors (44438265).

91911663 is a wasteful number, since it uses less digits than its factorization.

91911663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276054 (or 276051 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 91911663 is about 9587.0570562608. The cubic root of 91911663 is about 451.2912100341.

The spelling of 91911663 in words is "ninety-one million, nine hundred eleven thousand, six hundred sixty-three".