18012851 has 4 divisors (see below), whose sum is σ = 18025704. Its totient is φ = 18000000.

The previous prime is 18012847. The next prime is 18012853. The reversal of 18012851 is 15821081.

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

It is a cyclic number.

It is not a de Polignac number, because 18012851 - 2² = 18012847 is a prime.

It is a super-2 number, since 2×18012851² = 648925602296402, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18012851.

It is not an unprimeable number, because it can be changed into a prime (18012853) 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, 4025 + ... + 7226.

It is an arithmetic number, because the mean of its divisors is an integer number (4506426).

Almost surely, 2^18012851 is an apocalyptic number.

18012851 is a deficient number, since it is larger than the sum of its proper divisors (12853).

18012851 is a wasteful number, since it uses less digits than its factorization.

18012851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12852.

The product of its (nonzero) digits is 640, while the sum is 26.

The square root of 18012851 is about 4244.1549217718. The cubic root of 18012851 is about 262.1364933761.

It can be divided in two parts, 180 and 12851, that added together give a palindrome (13031).

The spelling of 18012851 in words is "eighteen million, twelve thousand, eight hundred fifty-one".