2556493 has 2 divisors, whose sum is σ = 2556494. Its totient is φ = 2556492.

The previous prime is 2556487. The next prime is 2556503. The reversal of 2556493 is 3946552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2550409 + 6084 = 1597^2 + 78^2 .

It is a cyclic number.

It is not a de Polignac number, because 2556493 - 2⁵ = 2556461 is a prime.

2556493 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2556403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278246 + 1278247.

It is an arithmetic number, because the mean of its divisors is an integer number (1278247).

2^2556493 is an apocalyptic number.

It is an amenable number.

2556493 is a deficient number, since it is larger than the sum of its proper divisors (1).

2556493 is an equidigital number, since it uses as much as digits as its factorization.

2556493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 34.

The square root of 2556493 is about 1598.9036869055. The cubic root of 2556493 is about 136.7355796284.

The spelling of 2556493 in words is "two million, five hundred fifty-six thousand, four hundred ninety-three".