30181213 has 2 divisors, whose sum is σ = 30181214. Its totient is φ = 30181212.

The previous prime is 30181211. The next prime is 30181219. The reversal of 30181213 is 31218103.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24334489 + 5846724 = 4933^2 + 2418^2 .

It is a cyclic number.

It is not a de Polignac number, because 30181213 - 2¹ = 30181211 is a prime.

Together with 30181211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30181211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15090606 + 15090607.

It is an arithmetic number, because the mean of its divisors is an integer number (15090607).

Almost surely, 2^30181213 is an apocalyptic number.

It is an amenable number.

30181213 is a deficient number, since it is larger than the sum of its proper divisors (1).

30181213 is an equidigital number, since it uses as much as digits as its factorization.

30181213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 30181213 is about 5493.7430773563. The cubic root of 30181213 is about 311.3476294650.

Adding to 30181213 its reverse (31218103), we get a palindrome (61399316).

The spelling of 30181213 in words is "thirty million, one hundred eighty-one thousand, two hundred thirteen".