18263197 has 2 divisors, whose sum is σ = 18263198. Its totient is φ = 18263196.

The previous prime is 18263183. The next prime is 18263207. The reversal of 18263197 is 79136281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13623481 + 4639716 = 3691^2 + 2154^2 .

It is a cyclic number.

It is not a de Polignac number, because 18263197 - 2¹⁹ = 17738909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18263137) 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, 9131598 + 9131599.

It is an arithmetic number, because the mean of its divisors is an integer number (9131599).

Almost surely, 2^18263197 is an apocalyptic number.

It is an amenable number.

18263197 is a deficient number, since it is larger than the sum of its proper divisors (1).

18263197 is an equidigital number, since it uses as much as digits as its factorization.

18263197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 18263197 is about 4273.5461855466. The cubic root of 18263197 is about 263.3453178686.

The spelling of 18263197 in words is "eighteen million, two hundred sixty-three thousand, one hundred ninety-seven".