18010649 has 4 divisors (see below), whose sum is σ = 18019764. Its totient is φ = 18001536.

The previous prime is 18010639. The next prime is 18010661. The reversal of 18010649 is 94601081.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7252249 + 10758400 = 2693^2 + 3280^2 .

It is a cyclic number.

It is not a de Polignac number, because 18010649 - 2²⁴ = 1233433 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18010609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212 + ... + 6005.

It is an arithmetic number, because the mean of its divisors is an integer number (4504941).

Almost surely, 2^18010649 is an apocalyptic number.

It is an amenable number.

18010649 is a deficient number, since it is larger than the sum of its proper divisors (9115).

18010649 is an equidigital number, since it uses as much as digits as its factorization.

18010649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9114.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 18010649 is about 4243.8954982422. The cubic root of 18010649 is about 262.1258112233.

The spelling of 18010649 in words is "eighteen million, ten thousand, six hundred forty-nine".