188909197 has 2 divisors, whose sum is σ = 188909198. Its totient is φ = 188909196.

The previous prime is 188909183. The next prime is 188909221. The reversal of 188909197 is 791909881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121242121 + 67667076 = 11011^2 + 8226^2 .

It is a cyclic number.

It is not a de Polignac number, because 188909197 - 2¹⁹ = 188384909 is a prime.

It is a super-2 number, since 2×188909197² = 71373369422369618, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188909297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94454598 + 94454599.

It is an arithmetic number, because the mean of its divisors is an integer number (94454599).

Almost surely, 2^188909197 is an apocalyptic number.

It is an amenable number.

188909197 is a deficient number, since it is larger than the sum of its proper divisors (1).

188909197 is an equidigital number, since it uses as much as digits as its factorization.

188909197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 52.

The square root of 188909197 is about 13744.4242149317. The cubic root of 188909197 is about 573.7874354058.

The spelling of 188909197 in words is "one hundred eighty-eight million, nine hundred nine thousand, one hundred ninety-seven".