18353513 has 2 divisors, whose sum is σ = 18353514. Its totient is φ = 18353512.

The previous prime is 18353507. The next prime is 18353521. The reversal of 18353513 is 31535381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18003049 + 350464 = 4243^2 + 592^2 .

It is an emirp because it is prime and its reverse (31535381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18353513 - 2¹⁰ = 18352489 is a prime.

It is not a weakly prime, because it can be changed into another prime (18350513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9176756 + 9176757.

It is an arithmetic number, because the mean of its divisors is an integer number (9176757).

Almost surely, 2^18353513 is an apocalyptic number.

It is an amenable number.

18353513 is a deficient number, since it is larger than the sum of its proper divisors (1).

18353513 is an equidigital number, since it uses as much as digits as its factorization.

18353513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 29.

The square root of 18353513 is about 4284.1000221750. The cubic root of 18353513 is about 263.7787066978.

Adding to 18353513 its reverse (31535381), we get a palindrome (49888894).

The spelling of 18353513 in words is "eighteen million, three hundred fifty-three thousand, five hundred thirteen".