18155413 has 2 divisors, whose sum is σ = 18155414. Its totient is φ = 18155412.

The previous prime is 18155407. The next prime is 18155437. The reversal of 18155413 is 31455181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9381969 + 8773444 = 3063^2 + 2962^2 .

It is a cyclic number.

It is not a de Polignac number, because 18155413 - 2¹³ = 18147221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18155443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9077706 + 9077707.

It is an arithmetic number, because the mean of its divisors is an integer number (9077707).

Almost surely, 2^18155413 is an apocalyptic number.

It is an amenable number.

18155413 is a deficient number, since it is larger than the sum of its proper divisors (1).

18155413 is an equidigital number, since it uses as much as digits as its factorization.

18155413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 28.

The square root of 18155413 is about 4260.9169201006. The cubic root of 18155413 is about 262.8262332426.

The spelling of 18155413 in words is "eighteen million, one hundred fifty-five thousand, four hundred thirteen".