188145121 has 2 divisors, whose sum is σ = 188145122. Its totient is φ = 188145120.

The previous prime is 188145109. The next prime is 188145157. The reversal of 188145121 is 121541881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187827025 + 318096 = 13705^2 + 564^2 .

It is a cyclic number.

It is not a de Polignac number, because 188145121 - 2⁹ = 188144609 is a prime.

It is a super-2 number, since 2×188145121² = 70797173112209282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (188145161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94072560 + 94072561.

It is an arithmetic number, because the mean of its divisors is an integer number (94072561).

Almost surely, 2^188145121 is an apocalyptic number.

It is an amenable number.

188145121 is a deficient number, since it is larger than the sum of its proper divisors (1).

188145121 is an equidigital number, since it uses as much as digits as its factorization.

188145121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2560, while the sum is 31.

The square root of 188145121 is about 13716.6001982999. The cubic root of 188145121 is about 573.0127958222.

The spelling of 188145121 in words is "one hundred eighty-eight million, one hundred forty-five thousand, one hundred twenty-one".