91445563 has 16 divisors (see below), whose sum is σ = 103124736. Its totient is φ = 80367840.

The previous prime is 91445561. The next prime is 91445569. The reversal of 91445563 is 36554419.

It is a cyclic number.

It is not a de Polignac number, because 91445563 - 2¹ = 91445561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91445561) 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, 47781 + ... + 49657.

It is an arithmetic number, because the mean of its divisors is an integer number (6445296).

Almost surely, 2^91445563 is an apocalyptic number.

91445563 is a deficient number, since it is larger than the sum of its proper divisors (11679173).

91445563 is a wasteful number, since it uses less digits than its factorization.

91445563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2034.

The product of its digits is 64800, while the sum is 37.

The square root of 91445563 is about 9562.7173439352. The cubic root of 91445563 is about 450.5270581674.

The spelling of 91445563 in words is "ninety-one million, four hundred forty-five thousand, five hundred sixty-three".