18245413 has 2 divisors, whose sum is σ = 18245414. Its totient is φ = 18245412.

The previous prime is 18245411. The next prime is 18245419. The reversal of 18245413 is 31454281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14010049 + 4235364 = 3743^2 + 2058^2 .

It is a cyclic number.

It is not a de Polignac number, because 18245413 - 2¹ = 18245411 is a prime.

Together with 18245411, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18245411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9122706 + 9122707.

It is an arithmetic number, because the mean of its divisors is an integer number (9122707).

Almost surely, 2^18245413 is an apocalyptic number.

It is an amenable number.

18245413 is a deficient number, since it is larger than the sum of its proper divisors (1).

18245413 is an equidigital number, since it uses as much as digits as its factorization.

18245413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 28.

The square root of 18245413 is about 4271.4649711779. The cubic root of 18245413 is about 263.2598115887.

Adding to 18245413 its reverse (31454281), we get a palindrome (49699694).

The spelling of 18245413 in words is "eighteen million, two hundred forty-five thousand, four hundred thirteen".