5145642809 has 2 divisors, whose sum is σ = 5145642810. Its totient is φ = 5145642808.

The previous prime is 5145642763. The next prime is 5145642847. The reversal of 5145642809 is 9082465415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4025268025 + 1120374784 = 63445^2 + 33472^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5145642809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5145642809.

It is not a weakly prime, because it can be changed into another prime (5145642889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2572821404 + 2572821405.

It is an arithmetic number, because the mean of its divisors is an integer number (2572821405).

Almost surely, 2^5145642809 is an apocalyptic number.

It is an amenable number.

5145642809 is a deficient number, since it is larger than the sum of its proper divisors (1).

5145642809 is an equidigital number, since it uses as much as digits as its factorization.

5145642809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 345600, while the sum is 44.

The square root of 5145642809 is about 71733.1360599828. The cubic root of 5145642809 is about 1726.4203448794.

The spelling of 5145642809 in words is "five billion, one hundred forty-five million, six hundred forty-two thousand, eight hundred nine".