791521 has 4 divisors (see below), whose sum is σ = 833200. Its totient is φ = 749844.

The previous prime is 791519. The next prime is 791543. The reversal of 791521 is 125197.

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.

It is a cyclic number.

It is not a de Polignac number, because 791521 - 2¹ = 791519 is a prime.

It is a Duffinian 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, 20811 + ... + 20848.

It is an arithmetic number, because the mean of its divisors is an integer number (208300).

2⁷⁹¹⁵²¹ is an apocalyptic number.

It is an amenable number.

791521 is a deficient number, since it is larger than the sum of its proper divisors (41679).

791521 is a wasteful number, since it uses less digits than its factorization.

791521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41678.

The product of its digits is 630, while the sum is 25.

The square root of 791521 is about 889.6746596369. The cubic root of 791521 is about 92.5026441903.

It can be divided in two parts, 79 and 1521, that added together give a square (1600 = 40²).

The spelling of 791521 in words is "seven hundred ninety-one thousand, five hundred twenty-one".