791581 has 4 divisors (see below), whose sum is σ = 904672. Its totient is φ = 678492.

The previous prime is 791573. The next prime is 791599. The reversal of 791581 is 185197.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 185197 = 41 ⋅4517.

It is a cyclic number.

It is not a de Polignac number, because 791581 - 2³ = 791573 is a prime.

It is a super-2 number, since 2×791581² = 1253200959122, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (791561) 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, 56535 + ... + 56548.

It is an arithmetic number, because the mean of its divisors is an integer number (226168).

2⁷⁹¹⁵⁸¹ is an apocalyptic number.

It is an amenable number.

791581 is a deficient number, since it is larger than the sum of its proper divisors (113091).

791581 is a wasteful number, since it uses less digits than its factorization.

791581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113090.

The product of its digits is 2520, while the sum is 31.

The square root of 791581 is about 889.7083791895. The cubic root of 791581 is about 92.5049814702.

The spelling of 791581 in words is "seven hundred ninety-one thousand, five hundred eighty-one".