18201116 has 12 divisors (see below), whose sum is σ = 31968888. Its totient is φ = 9067152.

The previous prime is 18201103. The next prime is 18201121. The reversal of 18201116 is 61110281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7106 + ... + 9321.

It is an arithmetic number, because the mean of its divisors is an integer number (2664074).

Almost surely, 2^18201116 is an apocalyptic number.

It is an amenable number.

18201116 is a deficient number, since it is larger than the sum of its proper divisors (13767772).

18201116 is a wasteful number, since it uses less digits than its factorization.

18201116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16708 (or 16706 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 20.

The square root of 18201116 is about 4266.2765967527. The cubic root of 18201116 is about 263.0465877654.

Adding to 18201116 its reverse (61110281), we get a palindrome (79311397).

It can be divided in two parts, 1820 and 1116, that multiplied together give a triangular number (2031120 = T₂₀₁₅).

The spelling of 18201116 in words is "eighteen million, two hundred one thousand, one hundred sixteen".