2656861 has 2 divisors, whose sum is σ = 2656862. Its totient is φ = 2656860.

The previous prime is 2656853. The next prime is 2656867. The reversal of 2656861 is 1686562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1836025 + 820836 = 1355^2 + 906^2 .

It is a cyclic number.

It is not a de Polignac number, because 2656861 - 2³ = 2656853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2656867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1328430 + 1328431.

It is an arithmetic number, because the mean of its divisors is an integer number (1328431).

2^2656861 is an apocalyptic number.

It is an amenable number.

2656861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2656861 is an equidigital number, since it uses as much as digits as its factorization.

2656861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 34.

The square root of 2656861 is about 1629.9880367659. The cubic root of 2656861 is about 138.5020743693.

Subtracting from 2656861 its reverse (1686562), we obtain a cube (970299 = 99³).

The spelling of 2656861 in words is "two million, six hundred fifty-six thousand, eight hundred sixty-one".