18650213 has 2 divisors, whose sum is σ = 18650214. Its totient is φ = 18650212.

The previous prime is 18650197. The next prime is 18650231. The reversal of 18650213 is 31205681.

Together with next prime (18650231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16144324 + 2505889 = 4018^2 + 1583^2 .

It is a cyclic number.

It is not a de Polignac number, because 18650213 - 2⁴ = 18650197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18650243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9325106 + 9325107.

It is an arithmetic number, because the mean of its divisors is an integer number (9325107).

Almost surely, 2^18650213 is an apocalyptic number.

It is an amenable number.

18650213 is a deficient number, since it is larger than the sum of its proper divisors (1).

18650213 is an equidigital number, since it uses as much as digits as its factorization.

18650213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 18650213 is about 4318.5892372394. The cubic root of 18650213 is about 265.1925170425.

Adding to 18650213 its reverse (31205681), we get a palindrome (49855894).

The spelling of 18650213 in words is "eighteen million, six hundred fifty thousand, two hundred thirteen".