18128897 has 2 divisors, whose sum is σ = 18128898. Its totient is φ = 18128896.

The previous prime is 18128879. The next prime is 18128911. The reversal of 18128897 is 79882181.

Together with previous prime (18128879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14776336 + 3352561 = 3844^2 + 1831^2 .

It is an emirp because it is prime and its reverse (79882181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18128897 - 2⁶ = 18128833 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18128827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9064448 + 9064449.

It is an arithmetic number, because the mean of its divisors is an integer number (9064449).

It is a Proth number, since it is equal to 2213 ⋅ 2¹³ + 1 and 2213 < 2¹³.

Almost surely, 2^18128897 is an apocalyptic number.

It is an amenable number.

18128897 is a deficient number, since it is larger than the sum of its proper divisors (1).

18128897 is an equidigital number, since it uses as much as digits as its factorization.

18128897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 44.

The square root of 18128897 is about 4257.8042463223. The cubic root of 18128897 is about 262.6982182360.

The spelling of 18128897 in words is "eighteen million, one hundred twenty-eight thousand, eight hundred ninety-seven".