6091721 has 4 divisors (see below), whose sum is σ = 6109332. Its totient is φ = 6074112.

The previous prime is 6091703. The next prime is 6091727. The reversal of 6091721 is 1271906.

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 1092025 + 4999696 = 1045^2 + 2236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6091721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6091727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8276 + ... + 8981.

It is an arithmetic number, because the mean of its divisors is an integer number (1527333).

Almost surely, 2^6091721 is an apocalyptic number.

It is an amenable number.

6091721 is a deficient number, since it is larger than the sum of its proper divisors (17611).

6091721 is a wasteful number, since it uses less digits than its factorization.

6091721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17610.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 6091721 is about 2468.1412034160. The cubic root of 6091721 is about 182.6333147383.

The spelling of 6091721 in words is "six million, ninety-one thousand, seven hundred twenty-one".