791681 has 4 divisors (see below), whose sum is σ = 863664. Its totient is φ = 719700.

The previous prime is 791677. The next prime is 791699. The reversal of 791681 is 186197.

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: 186197 = 11 ⋅16927.

It is a cyclic number.

It is not a de Polignac number, because 791681 - 2² = 791677 is a prime.

It is a super-2 number, since 2×791681² = 1253517611522, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 791681.

It is not an unprimeable number, because it can be changed into a prime (791081) 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, 35975 + ... + 35996.

It is an arithmetic number, because the mean of its divisors is an integer number (215916).

2⁷⁹¹⁶⁸¹ is an apocalyptic number.

It is an amenable number.

791681 is a deficient number, since it is larger than the sum of its proper divisors (71983).

791681 is a wasteful number, since it uses less digits than its factorization.

791681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71982.

The product of its digits is 3024, while the sum is 32.

The square root of 791681 is about 889.7645756041. The cubic root of 791681 is about 92.5088766743.

It can be divided in two parts, 7916 and 81, that added together give a palindrome (7997).

The spelling of 791681 in words is "seven hundred ninety-one thousand, six hundred eighty-one".