722281 has 4 divisors (see below), whose sum is σ = 825472. Its totient is φ = 619092.

The previous prime is 722273. The next prime is 722287. The reversal of 722281 is 182227.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 182227 = 149 ⋅1223.

It is a cyclic number.

It is not a de Polignac number, because 722281 - 2³ = 722273 is a prime.

It is a super-2 number, since 2×722281² = 1043379685922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (722287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51585 + ... + 51598.

It is an arithmetic number, because the mean of its divisors is an integer number (206368).

2⁷²²²⁸¹ is an apocalyptic number.

It is an amenable number.

722281 is a deficient number, since it is larger than the sum of its proper divisors (103191).

722281 is a wasteful number, since it uses less digits than its factorization.

722281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103190.

The product of its digits is 448, while the sum is 22.

The square root of 722281 is about 849.8711667070. The cubic root of 722281 is about 89.7226440837.

The spelling of 722281 in words is "seven hundred twenty-two thousand, two hundred eighty-one".