18082621 has 2 divisors, whose sum is σ = 18082622. Its totient is φ = 18082620.

The previous prime is 18082619. The next prime is 18082627. The reversal of 18082621 is 12628081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10304100 + 7778521 = 3210^2 + 2789^2 .

It is a cyclic number.

It is not a de Polignac number, because 18082621 - 2¹ = 18082619 is a prime.

Together with 18082619, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 18082621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18082627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9041310 + 9041311.

It is an arithmetic number, because the mean of its divisors is an integer number (9041311).

Almost surely, 2^18082621 is an apocalyptic number.

It is an amenable number.

18082621 is a deficient number, since it is larger than the sum of its proper divisors (1).

18082621 is an equidigital number, since it uses as much as digits as its factorization.

18082621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 18082621 is about 4252.3665175993. The cubic root of 18082621 is about 262.4745057629.

The spelling of 18082621 in words is "eighteen million, eighty-two thousand, six hundred twenty-one".