6489981 has 6 divisors (see below), whose sum is σ = 9374430. Its totient is φ = 4326648.

The previous prime is 6489953. The next prime is 6489983. The reversal of 6489981 is 1899846.

It can be written as a sum of positive squares in only one way, i.e., 3767481 + 2722500 = 1941^2 + 1650^2 .

It is not a de Polignac number, because 6489981 - 2⁵ = 6489949 is a prime.

It is a super-2 number, since 2×6489981² = 84239706760722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6489983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 360546 + ... + 360563.

It is an arithmetic number, because the mean of its divisors is an integer number (1562405).

Almost surely, 2^6489981 is an apocalyptic number.

It is an amenable number.

6489981 is a deficient number, since it is larger than the sum of its proper divisors (2884449).

6489981 is a wasteful number, since it uses less digits than its factorization.

6489981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721115 (or 721112 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 6489981 is about 2547.5441114925. The cubic root of 6489981 is about 186.5296212777.

It can be divided in two parts, 64899 and 81, that added together give a triangular number (64980 = T₃₆₀).

The spelling of 6489981 in words is "six million, four hundred eighty-nine thousand, nine hundred eighty-one".