18227197 has 2 divisors, whose sum is σ = 18227198. Its totient is φ = 18227196.

The previous prime is 18227159. The next prime is 18227203. The reversal of 18227197 is 79172281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9400356 + 8826841 = 3066^2 + 2971^2 .

It is a cyclic number.

It is not a de Polignac number, because 18227197 - 2²³ = 9838589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18227147) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9113598 + 9113599.

It is an arithmetic number, because the mean of its divisors is an integer number (9113599).

Almost surely, 2^18227197 is an apocalyptic number.

It is an amenable number.

18227197 is a deficient number, since it is larger than the sum of its proper divisors (1).

18227197 is an equidigital number, since it uses as much as digits as its factorization.

18227197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 37.

The square root of 18227197 is about 4269.3321491774. The cubic root of 18227197 is about 263.1721706101.

The spelling of 18227197 in words is "eighteen million, two hundred twenty-seven thousand, one hundred ninety-seven".