30790181 has 2 divisors, whose sum is σ = 30790182. Its totient is φ = 30790180.

The previous prime is 30790157. The next prime is 30790183. The reversal of 30790181 is 18109703.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29430625 + 1359556 = 5425^2 + 1166^2 .

It is an emirp because it is prime and its reverse (18109703) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30790181 is a prime.

It is a super-2 number, since 2×30790181² = 1896070492025522, which contains 22 as substring.

Together with 30790183, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30790183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15395090 + 15395091.

It is an arithmetic number, because the mean of its divisors is an integer number (15395091).

Almost surely, 2^30790181 is an apocalyptic number.

It is an amenable number.

30790181 is a deficient number, since it is larger than the sum of its proper divisors (1).

30790181 is an equidigital number, since it uses as much as digits as its factorization.

30790181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 30790181 is about 5548.8900691940. The cubic root of 30790181 is about 313.4277275834.

Adding to 30790181 its reverse (18109703), we get a palindrome (48899884).

The spelling of 30790181 in words is "thirty million, seven hundred ninety thousand, one hundred eighty-one".