18063613 has 4 divisors (see below), whose sum is σ = 18076608. Its totient is φ = 18050620.

The previous prime is 18063601. The next prime is 18063653. The reversal of 18063613 is 31636081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31636081 = 127 ⋅249103.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18063613 is a prime.

It is a super-2 number, since 2×18063613² = 652588229227538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18063653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4123 + ... + 7288.

It is an arithmetic number, because the mean of its divisors is an integer number (4519152).

Almost surely, 2^18063613 is an apocalyptic number.

It is an amenable number.

18063613 is a deficient number, since it is larger than the sum of its proper divisors (12995).

18063613 is a wasteful number, since it uses less digits than its factorization.

18063613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12994.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 18063613 is about 4250.1309391594. The cubic root of 18063613 is about 262.3825046352.

Adding to 18063613 its reverse (31636081), we get a palindrome (49699694).

It can be divided in two parts, 1806 and 3613, that multiplied together give a triangular number (6525078 = T₃₆₁₂).

The spelling of 18063613 in words is "eighteen million, sixty-three thousand, six hundred thirteen".