2613661409 has 2 divisors, whose sum is σ = 2613661410. Its totient is φ = 2613661408.

The previous prime is 2613661403. The next prime is 2613661417. The reversal of 2613661409 is 9041663162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2557830625 + 55830784 = 50575^2 + 7472^2 .

It is a cyclic number.

It is not a de Polignac number, because 2613661409 - 2¹² = 2613657313 is a prime.

It is not a weakly prime, because it can be changed into another prime (2613661403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1306830704 + 1306830705.

It is an arithmetic number, because the mean of its divisors is an integer number (1306830705).

Almost surely, 2^2613661409 is an apocalyptic number.

It is an amenable number.

2613661409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2613661409 is an equidigital number, since it uses as much as digits as its factorization.

2613661409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 2613661409 is about 51123.9807624563. The cubic root of 2613661409 is about 1377.4730429736.

The spelling of 2613661409 in words is "two billion, six hundred thirteen million, six hundred sixty-one thousand, four hundred nine".