18502213 has 2 divisors, whose sum is σ = 18502214. Its totient is φ = 18502212.

The previous prime is 18502207. The next prime is 18502229. The reversal of 18502213 is 31220581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17455684 + 1046529 = 4178^2 + 1023^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18502213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18502243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9251106 + 9251107.

It is an arithmetic number, because the mean of its divisors is an integer number (9251107).

Almost surely, 2^18502213 is an apocalyptic number.

It is an amenable number.

18502213 is a deficient number, since it is larger than the sum of its proper divisors (1).

18502213 is an equidigital number, since it uses as much as digits as its factorization.

18502213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 18502213 is about 4301.4198818530. The cubic root of 18502213 is about 264.4891690015.

Adding to 18502213 its reverse (31220581), we get a palindrome (49722794).

The spelling of 18502213 in words is "eighteen million, five hundred two thousand, two hundred thirteen".