18010997 has 2 divisors, whose sum is σ = 18010998. Its totient is φ = 18010996.

The previous prime is 18010991. The next prime is 18010999. The reversal of 18010997 is 79901081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17380561 + 630436 = 4169^2 + 794^2 .

It is a cyclic number.

It is not a de Polignac number, because 18010997 - 2⁴ = 18010981 is a prime.

Together with 18010999, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18010991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9005498 + 9005499.

It is an arithmetic number, because the mean of its divisors is an integer number (9005499).

Almost surely, 2^18010997 is an apocalyptic number.

It is an amenable number.

18010997 is a deficient number, since it is larger than the sum of its proper divisors (1).

18010997 is an equidigital number, since it uses as much as digits as its factorization.

18010997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 18010997 is about 4243.9364981112. The cubic root of 18010997 is about 262.1274994689.

The spelling of 18010997 in words is "eighteen million, ten thousand, nine hundred ninety-seven".