6521983 has 4 divisors (see below), whose sum is σ = 7023688. Its totient is φ = 6020280.

The previous prime is 6521951. The next prime is 6521987. The reversal of 6521983 is 3891256.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6521983 - 2⁵ = 6521951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6521987) 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 3 ways as a sum of consecutive naturals, for example, 250833 + ... + 250858.

It is an arithmetic number, because the mean of its divisors is an integer number (1755922).

Almost surely, 2^6521983 is an apocalyptic number.

6521983 is a deficient number, since it is larger than the sum of its proper divisors (501705).

6521983 is a wasteful number, since it uses less digits than its factorization.

6521983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501704.

The product of its digits is 12960, while the sum is 34.

The square root of 6521983 is about 2553.8173388087. The cubic root of 6521983 is about 186.8357103189.

It can be divided in two parts, 65 and 21983, that multiplied together give a triangular number (1428895 = T₁₆₉₀).

The spelling of 6521983 in words is "six million, five hundred twenty-one thousand, nine hundred eighty-three".