2555989 has 2 divisors, whose sum is σ = 2555990. Its totient is φ = 2555988.

The previous prime is 2555957. The next prime is 2556011. The reversal of 2555989 is 9895552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2528100 + 27889 = 1590^2 + 167^2 .

It is a cyclic number.

It is not a de Polignac number, because 2555989 - 2⁵ = 2555957 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2555089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1277994 + 1277995.

It is an arithmetic number, because the mean of its divisors is an integer number (1277995).

2^2555989 is an apocalyptic number.

It is an amenable number.

2555989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2555989 is an equidigital number, since it uses as much as digits as its factorization.

2555989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162000, while the sum is 43.

The square root of 2555989 is about 1598.7460711445. The cubic root of 2555989 is about 136.7265934559.

The spelling of 2555989 in words is "two million, five hundred fifty-five thousand, nine hundred eighty-nine".