30403213 has 2 divisors, whose sum is σ = 30403214. Its totient is φ = 30403212.

The previous prime is 30403183. The next prime is 30403237. The reversal of 30403213 is 31230403.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23941449 + 6461764 = 4893^2 + 2542^2 .

It is an emirp because it is prime and its reverse (31230403) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30403213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30403253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15201606 + 15201607.

It is an arithmetic number, because the mean of its divisors is an integer number (15201607).

Almost surely, 2^30403213 is an apocalyptic number.

It is an amenable number.

30403213 is a deficient number, since it is larger than the sum of its proper divisors (1).

30403213 is an equidigital number, since it uses as much as digits as its factorization.

30403213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 30403213 is about 5513.9108625367. The cubic root of 30403213 is about 312.1091450542.

Adding to 30403213 its reverse (31230403), we get a palindrome (61633616).

The spelling of 30403213 in words is "thirty million, four hundred three thousand, two hundred thirteen".