18661469 has 2 divisors, whose sum is σ = 18661470. Its totient is φ = 18661468.

The previous prime is 18661457. The next prime is 18661481. The reversal of 18661469 is 96416681.

It is a balanced prime because it is at equal distance from previous prime (18661457) and next prime (18661481).

It can be written as a sum of positive squares in only one way, i.e., 13764100 + 4897369 = 3710^2 + 2213^2 .

It is an emirp because it is prime and its reverse (96416681) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18661469 is a prime.

It is a super-2 number, since 2×18661469² = 696500850475922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18661429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9330734 + 9330735.

It is an arithmetic number, because the mean of its divisors is an integer number (9330735).

Almost surely, 2^18661469 is an apocalyptic number.

It is an amenable number.

18661469 is a deficient number, since it is larger than the sum of its proper divisors (1).

18661469 is an equidigital number, since it uses as much as digits as its factorization.

18661469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 41.

The square root of 18661469 is about 4319.8922440265. The cubic root of 18661469 is about 265.2458570349.

The spelling of 18661469 in words is "eighteen million, six hundred sixty-one thousand, four hundred sixty-nine".