91216963 has 2 divisors, whose sum is σ = 91216964. Its totient is φ = 91216962.

The previous prime is 91216921. The next prime is 91216991. The reversal of 91216963 is 36961219.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91216963 is a prime.

It is not a weakly prime, because it can be changed into another prime (91216913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45608481 + 45608482.

It is an arithmetic number, because the mean of its divisors is an integer number (45608482).

Almost surely, 2^91216963 is an apocalyptic number.

91216963 is a deficient number, since it is larger than the sum of its proper divisors (1).

91216963 is an equidigital number, since it uses as much as digits as its factorization.

91216963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 37.

The square root of 91216963 is about 9550.7571951129. The cubic root of 91216963 is about 450.1513285286.

The spelling of 91216963 in words is "ninety-one million, two hundred sixteen thousand, nine hundred sixty-three".