186845489 has 2 divisors, whose sum is σ = 186845490. Its totient is φ = 186845488.

The previous prime is 186845467. The next prime is 186845497. The reversal of 186845489 is 984548681.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164044864 + 22800625 = 12808^2 + 4775^2 .

It is an emirp because it is prime and its reverse (984548681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 186845489 - 2¹² = 186841393 is a prime.

It is a super-2 number, since 2×186845489² = 69822473519298242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 186845489.

It is not a weakly prime, because it can be changed into another prime (186845459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93422744 + 93422745.

It is an arithmetic number, because the mean of its divisors is an integer number (93422745).

Almost surely, 2^186845489 is an apocalyptic number.

It is an amenable number.

186845489 is a deficient number, since it is larger than the sum of its proper divisors (1).

186845489 is an equidigital number, since it uses as much as digits as its factorization.

186845489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2211840, while the sum is 53.

The square root of 186845489 is about 13669.1436820307. The cubic root of 186845489 is about 571.6903643510.

The spelling of 186845489 in words is "one hundred eighty-six million, eight hundred forty-five thousand, four hundred eighty-nine".