791691 has 8 divisors (see below), whose sum is σ = 1062720. Its totient is φ = 524232.

The previous prime is 791677. The next prime is 791699. The reversal of 791691 is 196197.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 791691 - 2⁶ = 791627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (791699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 321 + ... + 1298.

It is an arithmetic number, because the mean of its divisors is an integer number (132840).

2⁷⁹¹⁶⁹¹ is an apocalyptic number.

791691 is a deficient number, since it is larger than the sum of its proper divisors (271029).

791691 is a wasteful number, since it uses less digits than its factorization.

791691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1785.

The product of its digits is 3402, while the sum is 33.

The square root of 791691 is about 889.7701950504. The cubic root of 791691 is about 92.5092661767.

It can be divided in two parts, 79 and 1691, that added together give a triangular number (1770 = T₅₉).

The spelling of 791691 in words is "seven hundred ninety-one thousand, six hundred ninety-one".