722021813 has 2 divisors, whose sum is σ = 722021814. Its totient is φ = 722021812.

The previous prime is 722021771. The next prime is 722021821. The reversal of 722021813 is 318120227.

722021813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 708464689 + 13557124 = 26617^2 + 3682^2 .

It is a cyclic number.

It is not a de Polignac number, because 722021813 - 2¹² = 722017717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (722021873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361010906 + 361010907.

It is an arithmetic number, because the mean of its divisors is an integer number (361010907).

Almost surely, 2^722021813 is an apocalyptic number.

It is an amenable number.

722021813 is a deficient number, since it is larger than the sum of its proper divisors (1).

722021813 is an equidigital number, since it uses as much as digits as its factorization.

722021813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 722021813 is about 26870.4635799236. The cubic root of 722021813 is about 897.1191062255.

The spelling of 722021813 in words is "seven hundred twenty-two million, twenty-one thousand, eight hundred thirteen".