188561473 has 2 divisors, whose sum is σ = 188561474. Its totient is φ = 188561472.

The previous prime is 188561411. The next prime is 188561489. The reversal of 188561473 is 374165881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129686544 + 58874929 = 11388^2 + 7673^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188561473 is a prime.

It is not a weakly prime, because it can be changed into another prime (188561573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94280736 + 94280737.

It is an arithmetic number, because the mean of its divisors is an integer number (94280737).

Almost surely, 2^188561473 is an apocalyptic number.

It is an amenable number.

188561473 is a deficient number, since it is larger than the sum of its proper divisors (1).

188561473 is an equidigital number, since it uses as much as digits as its factorization.

188561473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 43.

The square root of 188561473 is about 13731.7687498734. The cubic root of 188561473 is about 573.4351635049.

The spelling of 188561473 in words is "one hundred eighty-eight million, five hundred sixty-one thousand, four hundred seventy-three".