2580649 has 2 divisors, whose sum is σ = 2580650. Its totient is φ = 2580648.

The previous prime is 2580647. The next prime is 2580653. The reversal of 2580649 is 9460852.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2576025 + 4624 = 1605^2 + 68^2 .

It is a cyclic number.

It is not a de Polignac number, because 2580649 - 2¹ = 2580647 is a prime.

It is a super-2 number, since 2×2580649² = 13319498522402, which contains 22 as substring.

Together with 2580647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2580647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1290324 + 1290325.

It is an arithmetic number, because the mean of its divisors is an integer number (1290325).

2^2580649 is an apocalyptic number.

It is an amenable number.

2580649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2580649 is an equidigital number, since it uses as much as digits as its factorization.

2580649 is an evil number, because the sum of its binary digits is even.

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

The square root of 2580649 is about 1606.4398525933. The cubic root of 2580649 is about 137.1648963733.

It can be divided in two parts, 258064 and 9, that multiplied together give a square (2322576 = 1524²).

The spelling of 2580649 in words is "two million, five hundred eighty thousand, six hundred forty-nine".