2555639 has 2 divisors, whose sum is σ = 2555640. Its totient is φ = 2555638.

The previous prime is 2555629. The next prime is 2555647. The reversal of 2555639 is 9365552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2555639 - 2¹² = 2551543 is a prime.

It is a d-powerful number, because it can be written as 2¹⁹ + 5 + 5⁷ + 5⁹ + 6 + 3⁴ + 9 .

It is a junction number, because it is equal to n+sod(n) for n = 2555599 and 2555608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2555629) 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, 1277819 + 1277820.

It is an arithmetic number, because the mean of its divisors is an integer number (1277820).

2^2555639 is an apocalyptic number.

2555639 is a deficient number, since it is larger than the sum of its proper divisors (1).

2555639 is an equidigital number, since it uses as much as digits as its factorization.

2555639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40500, while the sum is 35.

The square root of 2555639 is about 1598.6366066120. The cubic root of 2555639 is about 136.7203523633.

The spelling of 2555639 in words is "two million, five hundred fifty-five thousand, six hundred thirty-nine".