18273133 has 2 divisors, whose sum is σ = 18273134. Its totient is φ = 18273132.

The previous prime is 18273131. The next prime is 18273163. The reversal of 18273133 is 33137281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15389929 + 2883204 = 3923^2 + 1698^2 .

It is a cyclic number.

It is not a de Polignac number, because 18273133 - 2¹ = 18273131 is a prime.

Together with 18273131, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18273131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9136566 + 9136567.

It is an arithmetic number, because the mean of its divisors is an integer number (9136567).

Almost surely, 2^18273133 is an apocalyptic number.

It is an amenable number.

18273133 is a deficient number, since it is larger than the sum of its proper divisors (1).

18273133 is an equidigital number, since it uses as much as digits as its factorization.

18273133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 28.

The square root of 18273133 is about 4274.7085280753. The cubic root of 18273133 is about 263.3930664402.

The spelling of 18273133 in words is "eighteen million, two hundred seventy-three thousand, one hundred thirty-three".