18163133 has 4 divisors (see below), whose sum is σ = 18343068. Its totient is φ = 17983200.

The previous prime is 18163121. The next prime is 18163141. The reversal of 18163133 is 33136181.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15194404 + 2968729 = 3898^2 + 1723^2 .

It is a cyclic number.

It is not a de Polignac number, because 18163133 - 2¹⁸ = 17900989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18163163) 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, 89816 + ... + 90017.

It is an arithmetic number, because the mean of its divisors is an integer number (4585767).

It is a self-describing number.

Almost surely, 2^18163133 is an apocalyptic number.

It is an amenable number.

18163133 is a deficient number, since it is larger than the sum of its proper divisors (179935).

18163133 is a wasteful number, since it uses less digits than its factorization.

18163133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179934.

The product of its digits is 1296, while the sum is 26.

The square root of 18163133 is about 4261.8227321183. The cubic root of 18163133 is about 262.8634807382.

The spelling of 18163133 in words is "eighteen million, one hundred sixty-three thousand, one hundred thirty-three".