18661283 has 4 divisors (see below), whose sum is σ = 19165680. Its totient is φ = 18156888.

The previous prime is 18661277. The next prime is 18661289. The reversal of 18661283 is 38216681.

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

It is an interprime number because it is at equal distance from previous prime (18661277) and next prime (18661289).

It is a cyclic number.

It is not a de Polignac number, because 18661283 - 2¹⁰ = 18660259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18661289) 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, 252143 + ... + 252216.

It is an arithmetic number, because the mean of its divisors is an integer number (4791420).

Almost surely, 2^18661283 is an apocalyptic number.

18661283 is a deficient number, since it is larger than the sum of its proper divisors (504397).

18661283 is an equidigital number, since it uses as much as digits as its factorization.

18661283 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504396.

The product of its digits is 13824, while the sum is 35.

The square root of 18661283 is about 4319.8707156581. The cubic root of 18661283 is about 265.2449757914.

The spelling of 18661283 in words is "eighteen million, six hundred sixty-one thousand, two hundred eighty-three".