6481809 has 16 divisors (see below), whose sum is σ = 9642240. Its totient is φ = 4303440.

The previous prime is 6481807. The next prime is 6481823. The reversal of 6481809 is 9081846.

It is a happy number.

6481809 is a `hidden beast` number, since 648 + 1 + 8 + 0 + 9 = 666.

It is not a de Polignac number, because 6481809 - 2¹ = 6481807 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6481807) 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, 11359 + ... + 11915.

It is an arithmetic number, because the mean of its divisors is an integer number (602640).

Almost surely, 2^6481809 is an apocalyptic number.

It is an amenable number.

6481809 is a deficient number, since it is larger than the sum of its proper divisors (3160431).

6481809 is a wasteful number, since it uses less digits than its factorization.

6481809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997 (or 991 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 6481809 is about 2545.9397086341. The cubic root of 6481809 is about 186.4512974579.

The spelling of 6481809 in words is "six million, four hundred eighty-one thousand, eight hundred nine".