18244013 has 2 divisors, whose sum is σ = 18244014. Its totient is φ = 18244012.

The previous prime is 18244001. The next prime is 18244019. The reversal of 18244013 is 31044281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17156164 + 1087849 = 4142^2 + 1043^2 .

It is a cyclic number.

It is not a de Polignac number, because 18244013 - 2⁶ = 18243949 is a prime.

It is equal to p_1165901 and since 18244013 and 1165901 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18244013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18244019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9122006 + 9122007.

It is an arithmetic number, because the mean of its divisors is an integer number (9122007).

Almost surely, 2^18244013 is an apocalyptic number.

It is an amenable number.

18244013 is a deficient number, since it is larger than the sum of its proper divisors (1).

18244013 is an equidigital number, since it uses as much as digits as its factorization.

18244013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 18244013 is about 4271.3010898320. The cubic root of 18244013 is about 263.2530779663.

Adding to 18244013 its reverse (31044281), we get a palindrome (49288294).

The spelling of 18244013 in words is "eighteen million, two hundred forty-four thousand, thirteen".