2556534389 has 2 divisors, whose sum is σ = 2556534390. Its totient is φ = 2556534388.

The previous prime is 2556534367. The next prime is 2556534413. The reversal of 2556534389 is 9834356552.

2556534389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2494203364 + 62331025 = 49942^2 + 7895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2556534389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2556534359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278267194 + 1278267195.

It is an arithmetic number, because the mean of its divisors is an integer number (1278267195).

Almost surely, 2^2556534389 is an apocalyptic number.

It is an amenable number.

2556534389 is a deficient number, since it is larger than the sum of its proper divisors (1).

2556534389 is an equidigital number, since it uses as much as digits as its factorization.

2556534389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888000, while the sum is 50.

The square root of 2556534389 is about 50562.1833883783. The cubic root of 2556534389 is about 1367.3631752966.

The spelling of 2556534389 in words is "two billion, five hundred fifty-six million, five hundred thirty-four thousand, three hundred eighty-nine".