188949517 has 2 divisors, whose sum is σ = 188949518. Its totient is φ = 188949516.

The previous prime is 188949479. The next prime is 188949521. The reversal of 188949517 is 715949881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118069956 + 70879561 = 10866^2 + 8419^2 .

It is an emirp because it is prime and its reverse (715949881) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188949517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188949217) 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, 94474758 + 94474759.

It is an arithmetic number, because the mean of its divisors is an integer number (94474759).

Almost surely, 2^188949517 is an apocalyptic number.

It is an amenable number.

188949517 is a deficient number, since it is larger than the sum of its proper divisors (1).

188949517 is an equidigital number, since it uses as much as digits as its factorization.

188949517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 52.

The square root of 188949517 is about 13745.8909132875. The cubic root of 188949517 is about 573.8282547765.

The spelling of 188949517 in words is "one hundred eighty-eight million, nine hundred forty-nine thousand, five hundred seventeen".