123143281 has 2 divisors, whose sum is σ = 123143282. Its totient is φ = 123143280.

The previous prime is 123143263. The next prime is 123143299. The reversal of 123143281 is 182341321.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (123143263) and next prime (123143299).

It can be written as a sum of positive squares in only one way, i.e., 112021056 + 11122225 = 10584^2 + 3335^2 .

It is a cyclic number.

It is not a de Polignac number, because 123143281 - 2¹¹ = 123141233 is a prime.

It is a super-2 number, since 2×123143281² = 30328535310889922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (123143261) 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, 61571640 + 61571641.

It is an arithmetic number, because the mean of its divisors is an integer number (61571641).

Almost surely, 2^123143281 is an apocalyptic number.

It is an amenable number.

123143281 is a deficient number, since it is larger than the sum of its proper divisors (1).

123143281 is an equidigital number, since it uses as much as digits as its factorization.

123143281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 25.

The square root of 123143281 is about 11096.9942326740. The cubic root of 123143281 is about 497.5120150630.

The spelling of 123143281 in words is "one hundred twenty-three million, one hundred forty-three thousand, two hundred eighty-one".