18040513 has 2 divisors, whose sum is σ = 18040514. Its totient is φ = 18040512.

The previous prime is 18040507. The next prime is 18040531. The reversal of 18040513 is 31504081.

Together with next prime (18040531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9935104 + 8105409 = 3152^2 + 2847^2 .

It is a cyclic number.

It is not a de Polignac number, because 18040513 - 2¹³ = 18032321 is a prime.

It is not a weakly prime, because it can be changed into another prime (18040013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9020256 + 9020257.

It is an arithmetic number, because the mean of its divisors is an integer number (9020257).

Almost surely, 2^18040513 is an apocalyptic number.

It is an amenable number.

18040513 is a deficient number, since it is larger than the sum of its proper divisors (1).

18040513 is an equidigital number, since it uses as much as digits as its factorization.

18040513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 18040513 is about 4247.4125064561. The cubic root of 18040513 is about 262.2706107902.

Adding to 18040513 its reverse (31504081), we get a palindrome (49544594).

The spelling of 18040513 in words is "eighteen million, forty thousand, five hundred thirteen".