2661647 has 2 divisors, whose sum is σ = 2661648. Its totient is φ = 2661646.

The previous prime is 2661643. The next prime is 2661661. The reversal of 2661647 is 7461662.

2661647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2661647 - 2² = 2661643 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2661641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330823 + 1330824.

It is an arithmetic number, because the mean of its divisors is an integer number (1330824).

2^2661647 is an apocalyptic number.

2661647 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661647 is an equidigital number, since it uses as much as digits as its factorization.

2661647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 32.

The square root of 2661647 is about 1631.4554851420. The cubic root of 2661647 is about 138.5851891552.

The spelling of 2661647 in words is "two million, six hundred sixty-one thousand, six hundred forty-seven".