18508129 has 2 divisors, whose sum is σ = 18508130. Its totient is φ = 18508128.

The previous prime is 18508117. The next prime is 18508141. The reversal of 18508129 is 92180581.

It is a balanced prime because it is at equal distance from previous prime (18508117) and next prime (18508141).

It can be written as a sum of positive squares in only one way, i.e., 17181025 + 1327104 = 4145^2 + 1152^2 .

It is a cyclic number.

It is not a de Polignac number, because 18508129 - 2⁷ = 18508001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18508094 and 18508103.

It is not a weakly prime, because it can be changed into another prime (18508159) 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, 9254064 + 9254065.

It is an arithmetic number, because the mean of its divisors is an integer number (9254065).

Almost surely, 2^18508129 is an apocalyptic number.

It is an amenable number.

18508129 is a deficient number, since it is larger than the sum of its proper divisors (1).

18508129 is an equidigital number, since it uses as much as digits as its factorization.

18508129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 18508129 is about 4302.1075067925. The cubic root of 18508129 is about 264.5173557412.

The spelling of 18508129 in words is "eighteen million, five hundred eight thousand, one hundred twenty-nine".