722561 has 8 divisors (see below), whose sum is σ = 834240. Its totient is φ = 613008.

The previous prime is 722539. The next prime is 722563. The reversal of 722561 is 165227.

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 722561 - 2¹⁸ = 460417 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 722561.

It is not an unprimeable number, because it can be changed into a prime (722563) 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 7 ways as a sum of consecutive naturals, for example, 290 + ... + 1236.

It is an arithmetic number, because the mean of its divisors is an integer number (104280).

2⁷²²⁵⁶¹ is an apocalyptic number.

It is an amenable number.

722561 is a deficient number, since it is larger than the sum of its proper divisors (111679).

722561 is a wasteful number, since it uses less digits than its factorization.

722561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063.

The product of its digits is 840, while the sum is 23.

The square root of 722561 is about 850.0358815956. The cubic root of 722561 is about 89.7342365686.

Adding to 722561 its reverse (165227), we get a palindrome (887788).

The spelling of 722561 in words is "seven hundred twenty-two thousand, five hundred sixty-one".