18197129 has 2 divisors, whose sum is σ = 18197130. Its totient is φ = 18197128.

The previous prime is 18197099. The next prime is 18197149. The reversal of 18197129 is 92179181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13690000 + 4507129 = 3700^2 + 2123^2 .

It is a cyclic number.

It is not a de Polignac number, because 18197129 - 2¹⁶ = 18131593 is a prime.

It is a super-2 number, since 2×18197129² = 662271007685282, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18197092 and 18197101.

It is not a weakly prime, because it can be changed into another prime (18197149) 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, 9098564 + 9098565.

It is an arithmetic number, because the mean of its divisors is an integer number (9098565).

Almost surely, 2^18197129 is an apocalyptic number.

It is an amenable number.

18197129 is a deficient number, since it is larger than the sum of its proper divisors (1).

18197129 is an equidigital number, since it uses as much as digits as its factorization.

18197129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 38.

The square root of 18197129 is about 4265.8093018793. The cubic root of 18197129 is about 263.0273793584.

The spelling of 18197129 in words is "eighteen million, one hundred ninety-seven thousand, one hundred twenty-nine".