18351413 has 2 divisors, whose sum is σ = 18351414. Its totient is φ = 18351412.

The previous prime is 18351391. The next prime is 18351433. The reversal of 18351413 is 31415381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10387729 + 7963684 = 3223^2 + 2822^2 .

It is a cyclic number.

It is not a de Polignac number, because 18351413 - 2²⁴ = 1574197 is a prime.

It is a super-3 number, since 3×18351413³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18351433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9175706 + 9175707.

It is an arithmetic number, because the mean of its divisors is an integer number (9175707).

Almost surely, 2^18351413 is an apocalyptic number.

It is an amenable number.

18351413 is a deficient number, since it is larger than the sum of its proper divisors (1).

18351413 is an equidigital number, since it uses as much as digits as its factorization.

18351413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 26.

The square root of 18351413 is about 4283.8549228469. The cubic root of 18351413 is about 263.7686458371.

Adding to 18351413 its reverse (31415381), we get a palindrome (49766794).

The spelling of 18351413 in words is "eighteen million, three hundred fifty-one thousand, four hundred thirteen".