6491563 has 16 divisors (see below), whose sum is σ = 7368480. Its totient is φ = 5677056.

The previous prime is 6491561. The next prime is 6491623. The reversal of 6491563 is 3651946.

6491563 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a 13-Lehmer number, since φ(6491563) divides (6491563-1)¹³.

It is a cyclic number.

It is not a de Polignac number, because 6491563 - 2¹ = 6491561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6491561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25131 + ... + 25387.

It is an arithmetic number, because the mean of its divisors is an integer number (460530).

Almost surely, 2^6491563 is an apocalyptic number.

6491563 is a deficient number, since it is larger than the sum of its proper divisors (876917).

6491563 is a wasteful number, since it uses less digits than its factorization.

6491563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366.

The product of its digits is 19440, while the sum is 34.

The square root of 6491563 is about 2547.8545876875. The cubic root of 6491563 is about 186.5447762212.

The spelling of 6491563 in words is "six million, four hundred ninety-one thousand, five hundred sixty-three".