730725221 has 2 divisors, whose sum is σ = 730725222. Its totient is φ = 730725220.

The previous prime is 730725143. The next prime is 730725241. The reversal of 730725221 is 122527037.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 708304996 + 22420225 = 26614^2 + 4735^2 .

It is an emirp because it is prime and its reverse (122527037) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 730725221 - 2¹⁴ = 730708837 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (730725241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365362610 + 365362611.

It is an arithmetic number, because the mean of its divisors is an integer number (365362611).

Almost surely, 2^730725221 is an apocalyptic number.

It is an amenable number.

730725221 is a deficient number, since it is larger than the sum of its proper divisors (1).

730725221 is an equidigital number, since it uses as much as digits as its factorization.

730725221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 730725221 is about 27031.9296573515. The cubic root of 730725221 is about 900.7094081651.

The spelling of 730725221 in words is "seven hundred thirty million, seven hundred twenty-five thousand, two hundred twenty-one".