281488189 has 2 divisors, whose sum is σ = 281488190. Its totient is φ = 281488188.

The previous prime is 281488187. The next prime is 281488243. The reversal of 281488189 is 981884182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152324964 + 129163225 = 12342^2 + 11365^2 .

It is a cyclic number.

It is not a de Polignac number, because 281488189 - 2¹ = 281488187 is a prime.

Together with 281488187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281488183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140744094 + 140744095.

It is an arithmetic number, because the mean of its divisors is an integer number (140744095).

Almost surely, 2^281488189 is an apocalyptic number.

It is an amenable number.

281488189 is a deficient number, since it is larger than the sum of its proper divisors (1).

281488189 is an equidigital number, since it uses as much as digits as its factorization.

281488189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 294912, while the sum is 49.

The square root of 281488189 is about 16777.6097522859. The cubic root of 281488189 is about 655.3702539257.

The spelling of 281488189 in words is "two hundred eighty-one million, four hundred eighty-eight thousand, one hundred eighty-nine".