18653213 has 2 divisors, whose sum is σ = 18653214. Its totient is φ = 18653212.

The previous prime is 18653209. The next prime is 18653273. The reversal of 18653213 is 31235681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17123044 + 1530169 = 4138^2 + 1237^2 .

It is a cyclic number.

It is not a de Polignac number, because 18653213 - 2² = 18653209 is a prime.

It is equal to p_1190369 and since 18653213 and 1190369 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18653273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9326606 + 9326607.

It is an arithmetic number, because the mean of its divisors is an integer number (9326607).

Almost surely, 2^18653213 is an apocalyptic number.

It is an amenable number.

18653213 is a deficient number, since it is larger than the sum of its proper divisors (1).

18653213 is an equidigital number, since it uses as much as digits as its factorization.

18653213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 29.

The square root of 18653213 is about 4318.9365589228. The cubic root of 18653213 is about 265.2067355557.

Adding to 18653213 its reverse (31235681), we get a palindrome (49888894).

The spelling of 18653213 in words is "eighteen million, six hundred fifty-three thousand, two hundred thirteen".