2556154891 has 2 divisors, whose sum is σ = 2556154892. Its totient is φ = 2556154890.

The previous prime is 2556154883. The next prime is 2556154903. The reversal of 2556154891 is 1984516552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2556154891 - 2³ = 2556154883 is a prime.

It is not a weakly prime, because it can be changed into another prime (2556154591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278077445 + 1278077446.

It is an arithmetic number, because the mean of its divisors is an integer number (1278077446).

Almost surely, 2^2556154891 is an apocalyptic number.

2556154891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2556154891 is an equidigital number, since it uses as much as digits as its factorization.

2556154891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432000, while the sum is 46.

The square root of 2556154891 is about 50558.4304641669. The cubic root of 2556154891 is about 1367.2955137426.

The spelling of 2556154891 in words is "two billion, five hundred fifty-six million, one hundred fifty-four thousand, eight hundred ninety-one".