18422197 has 2 divisors, whose sum is σ = 18422198. Its totient is φ = 18422196.

The previous prime is 18422171. The next prime is 18422213. The reversal of 18422197 is 79122481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13586596 + 4835601 = 3686^2 + 2199^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18422197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18422147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9211098 + 9211099.

It is an arithmetic number, because the mean of its divisors is an integer number (9211099).

Almost surely, 2^18422197 is an apocalyptic number.

It is an amenable number.

18422197 is a deficient number, since it is larger than the sum of its proper divisors (1).

18422197 is an equidigital number, since it uses as much as digits as its factorization.

18422197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 34.

The square root of 18422197 is about 4292.1086892109. The cubic root of 18422197 is about 264.1073417563.

The spelling of 18422197 in words is "eighteen million, four hundred twenty-two thousand, one hundred ninety-seven".