91310563 has 2 divisors, whose sum is σ = 91310564. Its totient is φ = 91310562.

The previous prime is 91310509. The next prime is 91310591. The reversal of 91310563 is 36501319.

It is an a-pointer prime, because the next prime (91310591) can be obtained adding 91310563 to its sum of digits (28).

It is a strong prime.

It is an emirp because it is prime and its reverse (36501319) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91310563 is a prime.

It is not a weakly prime, because it can be changed into another prime (91310963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45655281 + 45655282.

It is an arithmetic number, because the mean of its divisors is an integer number (45655282).

Almost surely, 2^91310563 is an apocalyptic number.

91310563 is a deficient number, since it is larger than the sum of its proper divisors (1).

91310563 is an equidigital number, since it uses as much as digits as its factorization.

91310563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 91310563 is about 9555.6560737607. The cubic root of 91310563 is about 450.3052463948.

It can be divided in two parts, 913 and 10563, that added together give a triangular number (11476 = T₁₅₁).

The spelling of 91310563 in words is "ninety-one million, three hundred ten thousand, five hundred sixty-three".