2555863 has 2 divisors, whose sum is σ = 2555864. Its totient is φ = 2555862.

The previous prime is 2555837. The next prime is 2555867. The reversal of 2555863 is 3685552.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2555863 - 2¹⁷ = 2424791 is a prime.

2555863 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2555867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1277931 + 1277932.

It is an arithmetic number, because the mean of its divisors is an integer number (1277932).

2^2555863 is an apocalyptic number.

2555863 is a deficient number, since it is larger than the sum of its proper divisors (1).

2555863 is an equidigital number, since it uses as much as digits as its factorization.

2555863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36000, while the sum is 34.

The square root of 2555863 is about 1598.7066647762. The cubic root of 2555863 is about 136.7243467282.

The spelling of 2555863 in words is "two million, five hundred fifty-five thousand, eight hundred sixty-three".