6451609 has 2 divisors, whose sum is σ = 6451610. Its totient is φ = 6451608.

The previous prime is 6451573. The next prime is 6451633. The reversal of 6451609 is 9061546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6451600 + 9 = 2540^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 6451609 - 2⁷ = 6451481 is a prime.

It is not a weakly prime, because it can be changed into another prime (6451649) 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, 3225804 + 3225805.

It is an arithmetic number, because the mean of its divisors is an integer number (3225805).

Almost surely, 2^6451609 is an apocalyptic number.

It is an amenable number.

6451609 is a deficient number, since it is larger than the sum of its proper divisors (1).

6451609 is an equidigital number, since it uses as much as digits as its factorization.

6451609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 6451609 is about 2540.0017716529. The cubic root of 6451609 is about 186.1612756996.

The spelling of 6451609 in words is "six million, four hundred fifty-one thousand, six hundred nine".