5691721 has 8 divisors (see below), whose sum is σ = 6547520. Its totient is φ = 4846608.

The previous prime is 5691709. The next prime is 5691739. The reversal of 5691721 is 1271965.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5691721 - 2⁵ = 5691689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5691701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1491 + ... + 3688.

It is an arithmetic number, because the mean of its divisors is an integer number (818440).

Almost surely, 2^5691721 is an apocalyptic number.

It is an amenable number.

5691721 is a deficient number, since it is larger than the sum of its proper divisors (855799).

5691721 is a wasteful number, since it uses less digits than its factorization.

5691721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5343.

The product of its digits is 3780, while the sum is 31.

The square root of 5691721 is about 2385.7328014679. The cubic root of 5691721 is about 178.5450720110.

The spelling of 5691721 in words is "five million, six hundred ninety-one thousand, seven hundred twenty-one".