188045281 has 2 divisors, whose sum is σ = 188045282. Its totient is φ = 188045280.

The previous prime is 188045237. The next prime is 188045317. The reversal of 188045281 is 182540881.

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., 170067681 + 17977600 = 13041^2 + 4240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188045281 is a prime.

It is a super-2 number, since 2×188045281² = 70722055412737922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 188045281.

It is not a weakly prime, because it can be changed into another prime (188045681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94022640 + 94022641.

It is an arithmetic number, because the mean of its divisors is an integer number (94022641).

Almost surely, 2^188045281 is an apocalyptic number.

It is an amenable number.

188045281 is a deficient number, since it is larger than the sum of its proper divisors (1).

188045281 is an equidigital number, since it uses as much as digits as its factorization.

188045281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20480, while the sum is 37.

The square root of 188045281 is about 13712.9603295569. The cubic root of 188045281 is about 572.9114206715.

The spelling of 188045281 in words is "one hundred eighty-eight million, forty-five thousand, two hundred eighty-one".