722081 has 4 divisors (see below), whose sum is σ = 724500. Its totient is φ = 719664.

The previous prime is 722077. The next prime is 722093. The reversal of 722081 is 180227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 180227 = 37 ⋅4871.

It can be written as a sum of positive squares in 2 ways, for example, as 312481 + 409600 = 559^2 + 640^2 .

It is a cyclic number.

It is not a de Polignac number, because 722081 - 2² = 722077 is a prime.

It is a super-2 number, since 2×722081² = 1042801941122, which contains 22 as substring.

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 722081.

It is not an unprimeable number, because it can be changed into a prime (722011) 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 3 ways as a sum of consecutive naturals, for example, 686 + ... + 1383.

It is an arithmetic number, because the mean of its divisors is an integer number (181125).

2⁷²²⁰⁸¹ is an apocalyptic number.

It is an amenable number.

722081 is a deficient number, since it is larger than the sum of its proper divisors (2419).

722081 is a wasteful number, since it uses less digits than its factorization.

722081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2418.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 722081 is about 849.7534936674. The cubic root of 722081 is about 89.7143619030.

The spelling of 722081 in words is "seven hundred twenty-two thousand, eighty-one".