2556091 has 2 divisors, whose sum is σ = 2556092. Its totient is φ = 2556090.

The previous prime is 2556079. The next prime is 2556101. The reversal of 2556091 is 1906552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2556091 - 2¹¹ = 2554043 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2556011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278045 + 1278046.

It is an arithmetic number, because the mean of its divisors is an integer number (1278046).

2^2556091 is an apocalyptic number.

2556091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2556091 is an equidigital number, since it uses as much as digits as its factorization.

2556091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 2556091 is about 1598.7779708265. Note that the first 3 decimals coincide. The cubic root of 2556091 is about 136.7284121814.

It can be divided in two parts, 25560 and 91, that added together give a triangular number (25651 = T₂₂₆).

The spelling of 2556091 in words is "two million, five hundred fifty-six thousand, ninety-one".