722191 has 4 divisors (see below), whose sum is σ = 724672. Its totient is φ = 719712.

The previous prime is 722173. The next prime is 722213. The reversal of 722191 is 191227.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 722191 - 2⁵ = 722159 is a prime.

It is a Duffinian 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, 735 + ... + 1408.

It is an arithmetic number, because the mean of its divisors is an integer number (181168).

2⁷²²¹⁹¹ is an apocalyptic number.

722191 is a deficient number, since it is larger than the sum of its proper divisors (2481).

722191 is a wasteful number, since it uses less digits than its factorization.

722191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2480.

The product of its digits is 252, while the sum is 22.

The square root of 722191 is about 849.8182158556. The cubic root of 722191 is about 89.7189172916.

The spelling of 722191 in words is "seven hundred twenty-two thousand, one hundred ninety-one".