6490981 has 6 divisors (see below), whose sum is σ = 7550790. Its totient is φ = 5563656.

The previous prime is 6490973. The next prime is 6490999. The reversal of 6490981 is 1890946.

It can be written as a sum of positive squares in only one way, i.e., 5597956 + 893025 = 2366^2 + 945^2 .

It is not a de Polignac number, because 6490981 - 2³ = 6490973 is a prime.

It is a super-2 number, since 2×6490981² = 84265668684722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6490981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6490921) 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 5 ways as a sum of consecutive naturals, for example, 66186 + ... + 66283.

It is an arithmetic number, because the mean of its divisors is an integer number (1258465).

Almost surely, 2^6490981 is an apocalyptic number.

It is an amenable number.

6490981 is a deficient number, since it is larger than the sum of its proper divisors (1059809).

6490981 is a wasteful number, since it uses less digits than its factorization.

6490981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132483 (or 132476 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 6490981 is about 2547.7403713879. The cubic root of 6490981 is about 186.5392011743.

The spelling of 6490981 in words is "six million, four hundred ninety thousand, nine hundred eighty-one".