2143993609909 has 2 divisors, whose sum is σ = 2143993609910. Its totient is φ = 2143993609908.

The previous prime is 2143993609871. The next prime is 2143993609939. The reversal of 2143993609909 is 9099063993412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2095010182225 + 48983427684 = 1447415^2 + 221322^2 .

It is a cyclic number.

It is not a de Polignac number, because 2143993609909 - 2⁷ = 2143993609781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2143993609939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1071996804954 + 1071996804955.

It is an arithmetic number, because the mean of its divisors is an integer number (1071996804955).

Almost surely, 2^{2143993609909} is an apocalyptic number.

It is an amenable number.

2143993609909 is a deficient number, since it is larger than the sum of its proper divisors (1).

2143993609909 is an equidigital number, since it uses as much as digits as its factorization.

2143993609909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25509168, while the sum is 64.

The spelling of 2143993609909 in words is "two trillion, one hundred forty-three billion, nine hundred ninety-three million, six hundred nine thousand, nine hundred nine".