6459881 has 4 divisors (see below), whose sum is σ = 6839892. Its totient is φ = 6079872.

The previous prime is 6459877. The next prime is 6459883. The reversal of 6459881 is 1889546.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1889546 = 2 ⋅944773.

It can be written as a sum of positive squares in 2 ways, for example, as 5216656 + 1243225 = 2284^2 + 1115^2 .

It is a cyclic number.

It is not a de Polignac number, because 6459881 - 2² = 6459877 is a prime.

It is a super-2 number, since 2×6459881² = 83460125068322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6459883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189980 + ... + 190013.

It is an arithmetic number, because the mean of its divisors is an integer number (1709973).

Almost surely, 2^6459881 is an apocalyptic number.

It is an amenable number.

6459881 is a deficient number, since it is larger than the sum of its proper divisors (380011).

6459881 is a wasteful number, since it uses less digits than its factorization.

6459881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380010.

The product of its digits is 69120, while the sum is 41.

The square root of 6459881 is about 2541.6295953581. The cubic root of 6459881 is about 186.2408046149.

The spelling of 6459881 in words is "six million, four hundred fifty-nine thousand, eight hundred eighty-one".