188041561 has 2 divisors, whose sum is σ = 188041562. Its totient is φ = 188041560.

The previous prime is 188041523. The next prime is 188041577. The reversal of 188041561 is 165140881.

It is a happy number.

188041561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175403536 + 12638025 = 13244^2 + 3555^2 .

It is an emirp because it is prime and its reverse (165140881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 188041561 - 2¹⁹ = 187517273 is a prime.

It is not a weakly prime, because it can be changed into another prime (188041591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94020780 + 94020781.

It is an arithmetic number, because the mean of its divisors is an integer number (94020781).

Almost surely, 2^188041561 is an apocalyptic number.

It is an amenable number.

188041561 is a deficient number, since it is larger than the sum of its proper divisors (1).

188041561 is an equidigital number, since it uses as much as digits as its factorization.

188041561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 34.

The square root of 188041561 is about 13712.8246907776. The cubic root of 188041561 is about 572.9076427790.

The spelling of 188041561 in words is "one hundred eighty-eight million, forty-one thousand, five hundred sixty-one".