91313563 has 16 divisors (see below), whose sum is σ = 106439040. Its totient is φ = 77457600.

The previous prime is 91313557. The next prime is 91313567. The reversal of 91313563 is 36531319.

It is not a de Polignac number, because 91313563 - 2⁵ = 91313531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91313567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10743 + ... + 17263.

It is an arithmetic number, because the mean of its divisors is an integer number (6652440).

Almost surely, 2^91313563 is an apocalyptic number.

91313563 is a deficient number, since it is larger than the sum of its proper divisors (15125477).

91313563 is a wasteful number, since it uses less digits than its factorization.

91313563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6618.

The product of its digits is 7290, while the sum is 31.

The square root of 91313563 is about 9555.8130475643. The cubic root of 91313563 is about 450.3101779197.

The spelling of 91313563 in words is "ninety-one million, three hundred thirteen thousand, five hundred sixty-three".