2143187869 has 2 divisors, whose sum is σ = 2143187870. Its totient is φ = 2143187868.

The previous prime is 2143187861. The next prime is 2143187881. The reversal of 2143187869 is 9687813412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2109105625 + 34082244 = 45925^2 + 5838^2 .

It is a cyclic number.

It is not a de Polignac number, because 2143187869 - 2³ = 2143187861 is a prime.

It is a super-2 number, since 2×2143187869² = 9186508483657522322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2143187861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1071593934 + 1071593935.

It is an arithmetic number, because the mean of its divisors is an integer number (1071593935).

Almost surely, 2^2143187869 is an apocalyptic number.

It is an amenable number.

2143187869 is a deficient number, since it is larger than the sum of its proper divisors (1).

2143187869 is an equidigital number, since it uses as much as digits as its factorization.

2143187869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 49.

The square root of 2143187869 is about 46294.5771014273. The cubic root of 2143187869 is about 1289.2983121787.

The spelling of 2143187869 in words is "two billion, one hundred forty-three million, one hundred eighty-seven thousand, eight hundred sixty-nine".