730193881 has 2 divisors, whose sum is σ = 730193882. Its totient is φ = 730193880.

The previous prime is 730193839. The next prime is 730193897. The reversal of 730193881 is 188391037.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 580376281 + 149817600 = 24091^2 + 12240^2 .

It is an emirp because it is prime and its reverse (188391037) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 730193881 - 2⁹ = 730193369 is a prime.

It is a super-2 number, since 2×730193881² = 1066366207699684322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (730193801) 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, 365096940 + 365096941.

It is an arithmetic number, because the mean of its divisors is an integer number (365096941).

Almost surely, 2^730193881 is an apocalyptic number.

It is an amenable number.

730193881 is a deficient number, since it is larger than the sum of its proper divisors (1).

730193881 is an equidigital number, since it uses as much as digits as its factorization.

730193881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 730193881 is about 27022.0998628900. The cubic root of 730193881 is about 900.4910410922.

The spelling of 730193881 in words is "seven hundred thirty million, one hundred ninety-three thousand, eight hundred eighty-one".