2655781 has 2 divisors, whose sum is σ = 2655782. Its totient is φ = 2655780.

The previous prime is 2655773. The next prime is 2655797. The reversal of 2655781 is 1875562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2117025 + 538756 = 1455^2 + 734^2 .

It is a cyclic number.

It is not a de Polignac number, because 2655781 - 2³ = 2655773 is a prime.

It is a super-2 number, since 2×2655781² = 14106345439922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2655701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1327890 + 1327891.

It is an arithmetic number, because the mean of its divisors is an integer number (1327891).

2^2655781 is an apocalyptic number.

It is an amenable number.

2655781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2655781 is an equidigital number, since it uses as much as digits as its factorization.

2655781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16800, while the sum is 34.

The square root of 2655781 is about 1629.6567123170. The cubic root of 2655781 is about 138.4833050380.

The spelling of 2655781 in words is "two million, six hundred fifty-five thousand, seven hundred eighty-one".