18274661 has 2 divisors, whose sum is σ = 18274662. Its totient is φ = 18274660.

The previous prime is 18274651. The next prime is 18274679. The reversal of 18274661 is 16647281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14250625 + 4024036 = 3775^2 + 2006^2 .

It is a cyclic number.

It is not a de Polignac number, because 18274661 - 2¹⁰ = 18273637 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18274651) 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 as a sum of consecutive naturals, namely, 9137330 + 9137331.

It is an arithmetic number, because the mean of its divisors is an integer number (9137331).

Almost surely, 2^18274661 is an apocalyptic number.

It is an amenable number.

18274661 is a deficient number, since it is larger than the sum of its proper divisors (1).

18274661 is an equidigital number, since it uses as much as digits as its factorization.

18274661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 35.

The square root of 18274661 is about 4274.8872499751. The cubic root of 18274661 is about 263.4004078813.

The spelling of 18274661 in words is "eighteen million, two hundred seventy-four thousand, six hundred sixty-one".