2656309 has 2 divisors, whose sum is σ = 2656310. Its totient is φ = 2656308.

The previous prime is 2656289. The next prime is 2656319. The reversal of 2656309 is 9036562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2093809 + 562500 = 1447^2 + 750^2 .

It is a cyclic number.

It is not a de Polignac number, because 2656309 - 2⁹ = 2655797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2656319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1328154 + 1328155.

It is an arithmetic number, because the mean of its divisors is an integer number (1328155).

2^2656309 is an apocalyptic number.

It is an amenable number.

2656309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2656309 is an equidigital number, since it uses as much as digits as its factorization.

2656309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 2656309 is about 1629.8187015739. The cubic root of 2656309 is about 138.4924817912.

The spelling of 2656309 in words is "two million, six hundred fifty-six thousand, three hundred nine".