730648921 has 2 divisors, whose sum is σ = 730648922. Its totient is φ = 730648920.

The previous prime is 730648817. The next prime is 730648949. The reversal of 730648921 is 129846037.

730648921 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., 608855625 + 121793296 = 24675^2 + 11036^2 .

It is an emirp because it is prime and its reverse (129846037) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 730648921 - 2⁹ = 730648409 is a prime.

It is not a weakly prime, because it can be changed into another prime (730648421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365324460 + 365324461.

It is an arithmetic number, because the mean of its divisors is an integer number (365324461).

Almost surely, 2^730648921 is an apocalyptic number.

It is an amenable number.

730648921 is a deficient number, since it is larger than the sum of its proper divisors (1).

730648921 is an equidigital number, since it uses as much as digits as its factorization.

730648921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 730648921 is about 27030.5183265138. The cubic root of 730648921 is about 900.6780573381.

The spelling of 730648921 in words is "seven hundred thirty million, six hundred forty-eight thousand, nine hundred twenty-one".