6491865 has 32 divisors (see below), whose sum is σ = 11206656. Its totient is φ = 3199680.

The previous prime is 6491861. The next prime is 6491867. The reversal of 6491865 is 5681946.

6491865 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6491865 - 2² = 6491861 is a prime.

It is a super-2 number, since 2×6491865² = 84288622356450, which contains 22 as substring.

6491865 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6491861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10392 + ... + 10998.

It is an arithmetic number, because the mean of its divisors is an integer number (350208).

Almost surely, 2^6491865 is an apocalyptic number.

It is an amenable number.

6491865 is a deficient number, since it is larger than the sum of its proper divisors (4714791).

6491865 is a wasteful number, since it uses less digits than its factorization.

6491865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669.

The product of its digits is 51840, while the sum is 39.

The square root of 6491865 is about 2547.9138525468. The cubic root of 6491865 is about 186.5476689837.

The spelling of 6491865 in words is "six million, four hundred ninety-one thousand, eight hundred sixty-five".