2123144809 has 2 divisors, whose sum is σ = 2123144810. Its totient is φ = 2123144808.

The previous prime is 2123144791. The next prime is 2123144813. The reversal of 2123144809 is 9084413212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1896341209 + 226803600 = 43547^2 + 15060^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123144809 - 2²¹ = 2121047657 is a prime.

It is not a weakly prime, because it can be changed into another prime (2123144869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061572404 + 1061572405.

It is an arithmetic number, because the mean of its divisors is an integer number (1061572405).

Almost surely, 2^2123144809 is an apocalyptic number.

It is an amenable number.

2123144809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123144809 is an equidigital number, since it uses as much as digits as its factorization.

2123144809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 2123144809 is about 46077.5955210339. The cubic root of 2123144809 is about 1285.2665516176.

The spelling of 2123144809 in words is "two billion, one hundred twenty-three million, one hundred forty-four thousand, eight hundred nine".