6485991 has 16 divisors (see below), whose sum is σ = 8937984. Its totient is φ = 4181184.

The previous prime is 6485987. The next prime is 6486001. The reversal of 6485991 is 1995846.

6485991 = 231² + 232² + ... + 316².

6485991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6485991 - 2² = 6485987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6485951) 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, 17490 + ... + 17856.

It is an arithmetic number, because the mean of its divisors is an integer number (558624).

Almost surely, 2^6485991 is an apocalyptic number.

6485991 is a deficient number, since it is larger than the sum of its proper divisors (2451993).

6485991 is a wasteful number, since it uses less digits than its factorization.

6485991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550.

The product of its digits is 77760, while the sum is 42.

The square root of 6485991 is about 2546.7608839465. The cubic root of 6485991 is about 186.4913876906.

The spelling of 6485991 in words is "six million, four hundred eighty-five thousand, nine hundred ninety-one".