722002181 has 4 divisors (see below), whose sum is σ = 723118752. Its totient is φ = 720885612.

The previous prime is 722002159. The next prime is 722002213. The reversal of 722002181 is 181200227.

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.

It is a cyclic number.

It is not a de Polignac number, because 722002181 - 2¹⁰ = 722001157 is a prime.

It is a super-2 number, since 2×722002181² = 1042574298737513522, which contains 22 as substring.

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 (722002381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 557315 + ... + 558608.

It is an arithmetic number, because the mean of its divisors is an integer number (180779688).

Almost surely, 2^722002181 is an apocalyptic number.

It is an amenable number.

722002181 is a deficient number, since it is larger than the sum of its proper divisors (1116571).

722002181 is a wasteful number, since it uses less digits than its factorization.

722002181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116570.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 722002181 is about 26870.0982692658. The cubic root of 722002181 is about 897.1109751683.

The spelling of 722002181 in words is "seven hundred twenty-two million, two thousand, one hundred eighty-one".