730273021 has 2 divisors, whose sum is σ = 730273022. Its totient is φ = 730273020.

The previous prime is 730273013. The next prime is 730273081. The reversal of 730273021 is 120372037.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 687173796 + 43099225 = 26214^2 + 6565^2 .

It is an emirp because it is prime and its reverse (120372037) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 730273021 - 2³ = 730273013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (730273001) 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, 365136510 + 365136511.

It is an arithmetic number, because the mean of its divisors is an integer number (365136511).

Almost surely, 2^730273021 is an apocalyptic number.

It is an amenable number.

730273021 is a deficient number, since it is larger than the sum of its proper divisors (1).

730273021 is an equidigital number, since it uses as much as digits as its factorization.

730273021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764, while the sum is 25.

The square root of 730273021 is about 27023.5641801743. The cubic root of 730273021 is about 900.5235723090.

The spelling of 730273021 in words is "seven hundred thirty million, two hundred seventy-three thousand, twenty-one".