791621 has 4 divisors (see below), whose sum is σ = 808512. Its totient is φ = 774732.

The previous prime is 791599. The next prime is 791627. The reversal of 791621 is 126197.

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: 126197 = 97 ⋅1301.

It is a cyclic number.

It is not a de Polignac number, because 791621 - 2¹⁴ = 775237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 791621.

It is not an unprimeable number, because it can be changed into a prime (791627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8375 + ... + 8468.

It is an arithmetic number, because the mean of its divisors is an integer number (202128).

2⁷⁹¹⁶²¹ is an apocalyptic number.

It is an amenable number.

791621 is a deficient number, since it is larger than the sum of its proper divisors (16891).

791621 is a wasteful number, since it uses less digits than its factorization.

791621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16890.

The product of its digits is 756, while the sum is 26.

The square root of 791621 is about 889.7308581813. The cubic root of 791621 is about 92.5065395912.

The spelling of 791621 in words is "seven hundred ninety-one thousand, six hundred twenty-one".