18214613 has 2 divisors, whose sum is σ = 18214614. Its totient is φ = 18214612.

The previous prime is 18214607. The next prime is 18214621. The reversal of 18214613 is 31641281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10608049 + 7606564 = 3257^2 + 2758^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18214613 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 (18234613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9107306 + 9107307.

It is an arithmetic number, because the mean of its divisors is an integer number (9107307).

Almost surely, 2^18214613 is an apocalyptic number.

It is an amenable number.

18214613 is a deficient number, since it is larger than the sum of its proper divisors (1).

18214613 is an equidigital number, since it uses as much as digits as its factorization.

18214613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 26.

The square root of 18214613 is about 4267.8581279138. The cubic root of 18214613 is about 263.1115922515. Note that the first 3 decimals are identical.

Adding to 18214613 its reverse (31641281), we get a palindrome (49855894).

The spelling of 18214613 in words is "eighteen million, two hundred fourteen thousand, six hundred thirteen".