18528197 has 2 divisors, whose sum is σ = 18528198. Its totient is φ = 18528196.

The previous prime is 18528163. The next prime is 18528221. The reversal of 18528197 is 79182581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18267076 + 261121 = 4274^2 + 511^2 .

It is a cyclic number.

It is not a de Polignac number, because 18528197 - 2¹⁴ = 18511813 is a prime.

It is a super-3 number, since 3×18528197³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18528137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9264098 + 9264099.

It is an arithmetic number, because the mean of its divisors is an integer number (9264099).

Almost surely, 2^18528197 is an apocalyptic number.

It is an amenable number.

18528197 is a deficient number, since it is larger than the sum of its proper divisors (1).

18528197 is an equidigital number, since it uses as much as digits as its factorization.

18528197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 41.

The square root of 18528197 is about 4304.4392201540. The cubic root of 18528197 is about 264.6129248625.

It can be divided in two parts, 185 and 28197, that added together give a palindrome (28382).

The spelling of 18528197 in words is "eighteen million, five hundred twenty-eight thousand, one hundred ninety-seven".