18661129 has 2 divisors, whose sum is σ = 18661130. Its totient is φ = 18661128.

The previous prime is 18661099. The next prime is 18661133. The reversal of 18661129 is 92116681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17935225 + 725904 = 4235^2 + 852^2 .

It is an emirp because it is prime and its reverse (92116681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18661129 - 2¹⁵ = 18628361 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18661094 and 18661103.

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 (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9330564 + 9330565.

It is an arithmetic number, because the mean of its divisors is an integer number (9330565).

Almost surely, 2^18661129 is an apocalyptic number.

It is an amenable number.

18661129 is a deficient number, since it is larger than the sum of its proper divisors (1).

18661129 is an equidigital number, since it uses as much as digits as its factorization.

18661129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 34.

The square root of 18661129 is about 4319.8528910138. The cubic root of 18661129 is about 265.2442461553.

The spelling of 18661129 in words is "eighteen million, six hundred sixty-one thousand, one hundred twenty-nine".