6415649 has 2 divisors, whose sum is σ = 6415650. Its totient is φ = 6415648.

The previous prime is 6415603. The next prime is 6415657. The reversal of 6415649 is 9465146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6250000 + 165649 = 2500^2 + 407^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6415649 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (6415679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3207824 + 3207825.

It is an arithmetic number, because the mean of its divisors is an integer number (3207825).

Almost surely, 2^6415649 is an apocalyptic number.

It is an amenable number.

6415649 is a deficient number, since it is larger than the sum of its proper divisors (1).

6415649 is an equidigital number, since it uses as much as digits as its factorization.

6415649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 35.

The square root of 6415649 is about 2532.9131449775. The cubic root of 6415649 is about 185.8147556396.

The spelling of 6415649 in words is "six million, four hundred fifteen thousand, six hundred forty-nine".