18289549 has 2 divisors, whose sum is σ = 18289550. Its totient is φ = 18289548.

The previous prime is 18289547. The next prime is 18289561. The reversal of 18289549 is 94598281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18275625 + 13924 = 4275^2 + 118^2 .

It is a cyclic number.

It is not a de Polignac number, because 18289549 - 2¹ = 18289547 is a prime.

Together with 18289547, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 18289499 and 18289508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18289541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9144774 + 9144775.

It is an arithmetic number, because the mean of its divisors is an integer number (9144775).

Almost surely, 2^18289549 is an apocalyptic number.

It is an amenable number.

18289549 is a deficient number, since it is larger than the sum of its proper divisors (1).

18289549 is an equidigital number, since it uses as much as digits as its factorization.

18289549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 46.

The square root of 18289549 is about 4276.6282279385. The cubic root of 18289549 is about 263.4719174764.

The spelling of 18289549 in words is "eighteen million, two hundred eighty-nine thousand, five hundred forty-nine".