18222613 has 2 divisors, whose sum is σ = 18222614. Its totient is φ = 18222612.

The previous prime is 18222587. The next prime is 18222667. The reversal of 18222613 is 31622281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16589329 + 1633284 = 4073^2 + 1278^2 .

It is an emirp because it is prime and its reverse (31622281) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18222613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18222683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9111306 + 9111307.

It is an arithmetic number, because the mean of its divisors is an integer number (9111307).

Almost surely, 2^18222613 is an apocalyptic number.

It is an amenable number.

18222613 is a deficient number, since it is larger than the sum of its proper divisors (1).

18222613 is an equidigital number, since it uses as much as digits as its factorization.

18222613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 25.

The square root of 18222613 is about 4268.7952633032. The cubic root of 18222613 is about 263.1501068341.

Adding to 18222613 its reverse (31622281), we get a palindrome (49844894).

The spelling of 18222613 in words is "eighteen million, two hundred twenty-two thousand, six hundred thirteen".