722124209 has 2 divisors, whose sum is σ = 722124210. Its totient is φ = 722124208.

The previous prime is 722124167. The next prime is 722124211. The reversal of 722124209 is 902421227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 613651984 + 108472225 = 24772^2 + 10415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-722124209 is a prime.

Together with 722124211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (722124229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361062104 + 361062105.

It is an arithmetic number, because the mean of its divisors is an integer number (361062105).

Almost surely, 2^722124209 is an apocalyptic number.

It is an amenable number.

722124209 is a deficient number, since it is larger than the sum of its proper divisors (1).

722124209 is an equidigital number, since it uses as much as digits as its factorization.

722124209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 722124209 is about 26872.3688758546. The cubic root of 722124209 is about 897.1615135619.

The spelling of 722124209 in words is "seven hundred twenty-two million, one hundred twenty-four thousand, two hundred nine".