30397813 has 2 divisors, whose sum is σ = 30397814. Its totient is φ = 30397812.

The previous prime is 30397747. The next prime is 30397817. The reversal of 30397813 is 31879303.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25979409 + 4418404 = 5097^2 + 2102^2 .

It is an emirp because it is prime and its reverse (31879303) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30397813 - 2¹⁷ = 30266741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30397817) 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, 15198906 + 15198907.

It is an arithmetic number, because the mean of its divisors is an integer number (15198907).

Almost surely, 2^30397813 is an apocalyptic number.

It is an amenable number.

30397813 is a deficient number, since it is larger than the sum of its proper divisors (1).

30397813 is an equidigital number, since it uses as much as digits as its factorization.

30397813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 30397813 is about 5513.4211701991. The cubic root of 30397813 is about 312.0906657663.

The spelling of 30397813 in words is "thirty million, three hundred ninety-seven thousand, eight hundred thirteen".