18106997 has 2 divisors, whose sum is σ = 18106998. Its totient is φ = 18106996.

The previous prime is 18106969. The next prime is 18107009. The reversal of 18106997 is 79960181.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15437041 + 2669956 = 3929^2 + 1634^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18106997 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18106597) 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, 9053498 + 9053499.

It is an arithmetic number, because the mean of its divisors is an integer number (9053499).

Almost surely, 2^18106997 is an apocalyptic number.

It is an amenable number.

18106997 is a deficient number, since it is larger than the sum of its proper divisors (1).

18106997 is an equidigital number, since it uses as much as digits as its factorization.

18106997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 18106997 is about 4255.2317210700. The cubic root of 18106997 is about 262.5923943839.

The spelling of 18106997 in words is "eighteen million, one hundred six thousand, nine hundred ninety-seven".