18128129 has 2 divisors, whose sum is σ = 18128130. Its totient is φ = 18128128.

The previous prime is 18128111. The next prime is 18128141. The reversal of 18128129 is 92182181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18105025 + 23104 = 4255^2 + 152^2 .

It is a cyclic number.

It is not a de Polignac number, because 18128129 - 2⁸ = 18127873 is a prime.

It is a super-2 number, since 2×18128129² = 657258122081282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18128095 and 18128104.

It is not a weakly prime, because it can be changed into another prime (18128189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9064064 + 9064065.

It is an arithmetic number, because the mean of its divisors is an integer number (9064065).

Almost surely, 2^18128129 is an apocalyptic number.

It is an amenable number.

18128129 is a deficient number, since it is larger than the sum of its proper divisors (1).

18128129 is an equidigital number, since it uses as much as digits as its factorization.

18128129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 32.

The square root of 18128129 is about 4257.7140580363. The cubic root of 18128129 is about 262.6945085953.

The spelling of 18128129 in words is "eighteen million, one hundred twenty-eight thousand, one hundred twenty-nine".