91797563 has 16 divisors (see below), whose sum is σ = 108116736. Its totient is φ = 76839840.

The previous prime is 91797551. The next prime is 91797583. The reversal of 91797563 is 36579719.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-91797563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91797583) 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, 103520 + ... + 104402.

It is an arithmetic number, because the mean of its divisors is an integer number (6757296).

Almost surely, 2^91797563 is an apocalyptic number.

91797563 is a deficient number, since it is larger than the sum of its proper divisors (16319173).

91797563 is a wasteful number, since it uses less digits than its factorization.

91797563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634.

The product of its digits is 357210, while the sum is 47.

The square root of 91797563 is about 9581.1044770423. The cubic root of 91797563 is about 451.1043869920.

The spelling of 91797563 in words is "ninety-one million, seven hundred ninety-seven thousand, five hundred sixty-three".