2559128849 has 2 divisors, whose sum is σ = 2559128850. Its totient is φ = 2559128848.

The previous prime is 2559128843. The next prime is 2559128893. The reversal of 2559128849 is 9488219552.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1844101249 + 715027600 = 42943^2 + 26740^2 .

It is a cyclic number.

It is not a de Polignac number, because 2559128849 - 2¹² = 2559124753 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2559128849.

It is not a weakly prime, because it can be changed into another prime (2559128843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1279564424 + 1279564425.

It is an arithmetic number, because the mean of its divisors is an integer number (1279564425).

Almost surely, 2^2559128849 is an apocalyptic number.

It is an amenable number.

2559128849 is a deficient number, since it is larger than the sum of its proper divisors (1).

2559128849 is an equidigital number, since it uses as much as digits as its factorization.

2559128849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2073600, while the sum is 53.

The square root of 2559128849 is about 50587.8330134826. The cubic root of 2559128849 is about 1367.8255681476.

The spelling of 2559128849 in words is "two billion, five hundred fifty-nine million, one hundred twenty-eight thousand, eight hundred forty-nine".