6109921 has 4 divisors (see below), whose sum is σ = 6275092. Its totient is φ = 5944752.

The previous prime is 6109907. The next prime is 6109937. The reversal of 6109921 is 1299016.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2739025 + 3370896 = 1655^2 + 1836^2 .

It is a cyclic number.

It is not a de Polignac number, because 6109921 - 2⁵ = 6109889 is a prime.

It is a super-2 number, since 2×6109921² = 74662269252482, which contains 22 as substring.

It is an Ulam number.

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 6109921.

It is not an unprimeable number, because it can be changed into a prime (6109951) 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, 82530 + ... + 82603.

It is an arithmetic number, because the mean of its divisors is an integer number (1568773).

Almost surely, 2^6109921 is an apocalyptic number.

It is an amenable number.

6109921 is a deficient number, since it is larger than the sum of its proper divisors (165171).

6109921 is a wasteful number, since it uses less digits than its factorization.

6109921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165170.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 6109921 is about 2471.8254388205. The cubic root of 6109921 is about 182.8150160756.

It can be divided in two parts, 6 and 109921, that multiplied together give a triangular number (659526 = T₁₁₄₈).

The spelling of 6109921 in words is "six million, one hundred nine thousand, nine hundred twenty-one".