18634169 has 2 divisors, whose sum is σ = 18634170. Its totient is φ = 18634168.

The previous prime is 18634141. The next prime is 18634171. The reversal of 18634169 is 96143681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11478544 + 7155625 = 3388^2 + 2675^2 .

It is an emirp because it is prime and its reverse (96143681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18634169 - 2⁸ = 18633913 is a prime.

It is a super-2 number, since 2×18634169² = 694464508641122, which contains 22 as substring.

Together with 18634171, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1189199 and since 18634169 and 1189199 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (18634129) 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, 9317084 + 9317085.

It is an arithmetic number, because the mean of its divisors is an integer number (9317085).

Almost surely, 2^18634169 is an apocalyptic number.

It is an amenable number.

18634169 is a deficient number, since it is larger than the sum of its proper divisors (1).

18634169 is an equidigital number, since it uses as much as digits as its factorization.

18634169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 38.

The square root of 18634169 is about 4316.7312865176. The cubic root of 18634169 is about 265.1164505406.

The spelling of 18634169 in words is "eighteen million, six hundred thirty-four thousand, one hundred sixty-nine".