722721613 has 2 divisors, whose sum is σ = 722721614. Its totient is φ = 722721612.

The previous prime is 722721607. The next prime is 722721647. The reversal of 722721613 is 316127227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 588208009 + 134513604 = 24253^2 + 11598^2 .

It is a cyclic number.

It is not a de Polignac number, because 722721613 - 2²⁵ = 689167181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (722721413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361360806 + 361360807.

It is an arithmetic number, because the mean of its divisors is an integer number (361360807).

Almost surely, 2^722721613 is an apocalyptic number.

It is an amenable number.

722721613 is a deficient number, since it is larger than the sum of its proper divisors (1).

722721613 is an equidigital number, since it uses as much as digits as its factorization.

722721613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 31.

The square root of 722721613 is about 26883.4821591251. The cubic root of 722721613 is about 897.4088487333.

The spelling of 722721613 in words is "seven hundred twenty-two million, seven hundred twenty-one thousand, six hundred thirteen".