722261 has 4 divisors (see below), whose sum is σ = 724224. Its totient is φ = 720300.

The previous prime is 722257. The next prime is 722273. The reversal of 722261 is 162227.

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: 162227 = 13 ⋅12479.

It is a cyclic number.

It is not a de Polignac number, because 722261 - 2² = 722257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722291) 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, 245 + ... + 1226.

It is an arithmetic number, because the mean of its divisors is an integer number (181056).

It is a Poulet number, since it divides 2⁷²²²⁶⁰-1.

2⁷²²²⁶¹ is an apocalyptic number.

722261 is the 491-st octagonal number.

It is an amenable number.

722261 is a deficient number, since it is larger than the sum of its proper divisors (1963).

722261 is a wasteful number, since it uses less digits than its factorization.

722261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1962.

The product of its digits is 336, while the sum is 20.

The square root of 722261 is about 849.8594001363. The cubic root of 722261 is about 89.7218159344.

Adding to 722261 its reverse (162227), we get a palindrome (884488).

It can be divided in two parts, 72226 and 1, that added together give a palindrome (72227).

The spelling of 722261 in words is "seven hundred twenty-two thousand, two hundred sixty-one".