188665249 has 2 divisors, whose sum is σ = 188665250. Its totient is φ = 188665248.

The previous prime is 188665219. The next prime is 188665259. The reversal of 188665249 is 942566881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177742224 + 10923025 = 13332^2 + 3305^2 .

It is an emirp because it is prime and its reverse (942566881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 188665249 - 2⁷ = 188665121 is a prime.

It is not a weakly prime, because it can be changed into another prime (188665219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94332624 + 94332625.

It is an arithmetic number, because the mean of its divisors is an integer number (94332625).

Almost surely, 2^188665249 is an apocalyptic number.

It is an amenable number.

188665249 is a deficient number, since it is larger than the sum of its proper divisors (1).

188665249 is an equidigital number, since it uses as much as digits as its factorization.

188665249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 829440, while the sum is 49.

The square root of 188665249 is about 13735.5469130283. The cubic root of 188665249 is about 573.5403421025.

The spelling of 188665249 in words is "one hundred eighty-eight million, six hundred sixty-five thousand, two hundred forty-nine".