791081563 has 4 divisors (see below), whose sum is σ = 791194320. Its totient is φ = 790968808.

The previous prime is 791081507. The next prime is 791081579. The reversal of 791081563 is 365180197.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-791081563 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (798081563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45103 + ... + 60136.

It is an arithmetic number, because the mean of its divisors is an integer number (197798580).

Almost surely, 2^791081563 is an apocalyptic number.

791081563 is a deficient number, since it is larger than the sum of its proper divisors (112757).

791081563 is a wasteful number, since it uses less digits than its factorization.

791081563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112756.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 791081563 is about 28126.1722066832. The cubic root of 791081563 is about 924.8552246757.

The spelling of 791081563 in words is "seven hundred ninety-one million, eighty-one thousand, five hundred sixty-three".