30203681 has 2 divisors, whose sum is σ = 30203682. Its totient is φ = 30203680.

The previous prime is 30203671. The next prime is 30203683. The reversal of 30203681 is 18630203.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22886656 + 7317025 = 4784^2 + 2705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30203681 is a prime.

It is a super-2 number, since 2×30203681² = 1824524691899522, which contains 22 as substring.

Together with 30203683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (30203683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15101840 + 15101841.

It is an arithmetic number, because the mean of its divisors is an integer number (15101841).

Almost surely, 2^30203681 is an apocalyptic number.

It is an amenable number.

30203681 is a deficient number, since it is larger than the sum of its proper divisors (1).

30203681 is an equidigital number, since it uses as much as digits as its factorization.

30203681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 30203681 is about 5495.7875686748. The cubic root of 30203681 is about 311.4248698263.

Adding to 30203681 its reverse (18630203), we get a palindrome (48833884).

The spelling of 30203681 in words is "thirty million, two hundred three thousand, six hundred eighty-one".