722581 has 2 divisors, whose sum is σ = 722582. Its totient is φ = 722580.

The previous prime is 722563. The next prime is 722599. The reversal of 722581 is 185227.

It is a balanced prime because it is at equal distance from previous prime (722563) and next prime (722599).

It can be written as a sum of positive squares in only one way, i.e., 722500 + 81 = 850^2 + 9^2 .

It is a cyclic number.

It is not a de Polignac number, because 722581 - 2⁹ = 722069 is a prime.

It is a super-2 number, since 2×722581² = 1044246603122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (722521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361290 + 361291.

It is an arithmetic number, because the mean of its divisors is an integer number (361291).

2⁷²²⁵⁸¹ is an apocalyptic number.

It is an amenable number.

722581 is a deficient number, since it is larger than the sum of its proper divisors (1).

722581 is an equidigital number, since it uses as much as digits as its factorization.

722581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1120, while the sum is 25.

The square root of 722581 is about 850.0476457235. The cubic root of 722581 is about 89.7350644886.

It can be divided in two parts, 7225 and 81, that multiplied together give a square (585225 = 765²).

The spelling of 722581 in words is "seven hundred twenty-two thousand, five hundred eighty-one".