188123489 has 2 divisors, whose sum is σ = 188123490. Its totient is φ = 188123488.

The previous prime is 188123473. The next prime is 188123527. The reversal of 188123489 is 984321881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116467264 + 71656225 = 10792^2 + 8465^2 .

It is a cyclic number.

It is not a de Polignac number, because 188123489 - 2⁴ = 188123473 is a prime.

It is a super-2 number, since 2×188123489² = 70780894227066242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (188125489) 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, 94061744 + 94061745.

It is an arithmetic number, because the mean of its divisors is an integer number (94061745).

Almost surely, 2^188123489 is an apocalyptic number.

It is an amenable number.

188123489 is a deficient number, since it is larger than the sum of its proper divisors (1).

188123489 is an equidigital number, since it uses as much as digits as its factorization.

188123489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 44.

The square root of 188123489 is about 13715.8116420429. The cubic root of 188123489 is about 572.9908342502.

The spelling of 188123489 in words is "one hundred eighty-eight million, one hundred twenty-three thousand, four hundred eighty-nine".