721624973 has 2 divisors, whose sum is σ = 721624974. Its totient is φ = 721624972.

The previous prime is 721624873. The next prime is 721625057. The reversal of 721624973 is 379426127.

721624973 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., 701031529 + 20593444 = 26477^2 + 4538^2 .

It is a cyclic number.

It is not a de Polignac number, because 721624973 - 2²⁴ = 704847757 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 721624973.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721624273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360812486 + 360812487.

It is an arithmetic number, because the mean of its divisors is an integer number (360812487).

Almost surely, 2^721624973 is an apocalyptic number.

It is an amenable number.

721624973 is a deficient number, since it is larger than the sum of its proper divisors (1).

721624973 is an equidigital number, since it uses as much as digits as its factorization.

721624973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 41.

The square root of 721624973 is about 26863.0782487786. The cubic root of 721624973 is about 896.9547169213.

The spelling of 721624973 in words is "seven hundred twenty-one million, six hundred twenty-four thousand, nine hundred seventy-three".