521722 has 4 divisors (see below), whose sum is σ = 782586. Its totient is φ = 260860.

The previous prime is 521707. The next prime is 521723. The reversal of 521722 is 227125.

521722 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 516961 + 4761 = 719^2 + 69^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 521722.

It is not an unprimeable number, because it can be changed into a prime (521723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130429 + ... + 130432.

2⁵²¹⁷²² is an apocalyptic number.

521722 is a deficient number, since it is larger than the sum of its proper divisors (260864).

521722 is a wasteful number, since it uses less digits than its factorization.

521722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260863.

The product of its digits is 280, while the sum is 19.

The square root of 521722 is about 722.3032604108. The cubic root of 521722 is about 80.5031826218.

Adding to 521722 its reverse (227125), we get a palindrome (748847).

The spelling of 521722 in words is "five hundred twenty-one thousand, seven hundred twenty-two".