6009921 has 6 divisors (see below), whose sum is σ = 8681010. Its totient is φ = 4006608.

The previous prime is 6009919. The next prime is 6009929. The reversal of 6009921 is 1299006.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 5574321 + 435600 = 2361^2 + 660^2 .

It is not a de Polignac number, because 6009921 - 2¹ = 6009919 is a prime.

It is a super-2 number, since 2×6009921² = 72238300852482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6009929) 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, 333876 + ... + 333893.

It is an arithmetic number, because the mean of its divisors is an integer number (1446835).

Almost surely, 2^6009921 is an apocalyptic number.

It is an amenable number.

6009921 is a deficient number, since it is larger than the sum of its proper divisors (2671089).

6009921 is a wasteful number, since it uses less digits than its factorization.

6009921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667775 (or 667772 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 6009921 is about 2451.5140219872. The cubic root of 6009921 is about 181.8121577625.

Subtracting from 6009921 its reverse (1299006), we obtain a triangular number (4710915 = T₃₀₆₉).

The spelling of 6009921 in words is "six million, nine thousand, nine hundred twenty-one".