91565063 has 2 divisors, whose sum is σ = 91565064. Its totient is φ = 91565062.

The previous prime is 91565059. The next prime is 91565083. The reversal of 91565063 is 36056519.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91565063 - 2² = 91565059 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91565053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45782531 + 45782532.

It is an arithmetic number, because the mean of its divisors is an integer number (45782532).

Almost surely, 2^91565063 is an apocalyptic number.

91565063 is a deficient number, since it is larger than the sum of its proper divisors (1).

91565063 is an equidigital number, since it uses as much as digits as its factorization.

91565063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24300, while the sum is 35.

The square root of 91565063 is about 9568.9635279899. The cubic root of 91565063 is about 450.7232205875.

The spelling of 91565063 in words is "ninety-one million, five hundred sixty-five thousand, sixty-three".