722501 has 8 divisors (see below), whose sum is σ = 785400. Its totient is φ = 660672.

The previous prime is 722489. The next prime is 722509. The reversal of 722501 is 105227.

It is a Cunningham number, because it is equal to 850²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 722500 = 1^2 + 850^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 722501 - 2¹⁴ = 706117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 722501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722509) 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, 1751 + ... + 2123.

It is an arithmetic number, because the mean of its divisors is an integer number (98175).

2⁷²²⁵⁰¹ is an apocalyptic number.

It is an amenable number.

722501 is a deficient number, since it is larger than the sum of its proper divisors (62899).

722501 is a wasteful number, since it uses less digits than its factorization.

722501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535.

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 722501 is about 850.0005882351. Note that the first 3 decimals coincide. The cubic root of 722501 is about 89.7317527168.

Adding to 722501 its reverse (105227), we get a palindrome (827728).

The spelling of 722501 in words is "seven hundred twenty-two thousand, five hundred one".