5709721 has 2 divisors, whose sum is σ = 5709722. Its totient is φ = 5709720.

The previous prime is 5709719. The next prime is 5709751. The reversal of 5709721 is 1279075.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4182025 + 1527696 = 2045^2 + 1236^2 .

It is a cyclic number.

It is not a de Polignac number, because 5709721 - 2¹ = 5709719 is a prime.

Together with 5709719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (5709751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2854860 + 2854861.

It is an arithmetic number, because the mean of its divisors is an integer number (2854861).

Almost surely, 2^5709721 is an apocalyptic number.

It is an amenable number.

5709721 is a deficient number, since it is larger than the sum of its proper divisors (1).

5709721 is an equidigital number, since it uses as much as digits as its factorization.

5709721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4410, while the sum is 31.

The square root of 5709721 is about 2389.5022494235. The cubic root of 5709721 is about 178.7330895049.

The spelling of 5709721 in words is "five million, seven hundred nine thousand, seven hundred twenty-one".