5611721 has 2 divisors, whose sum is σ = 5611722. Its totient is φ = 5611720.

The previous prime is 5611709. The next prime is 5611759. The reversal of 5611721 is 1271165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5593225 + 18496 = 2365^2 + 136^2 .

It is a cyclic number.

It is not a de Polignac number, because 5611721 - 2²² = 1417417 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (5611121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2805860 + 2805861.

It is an arithmetic number, because the mean of its divisors is an integer number (2805861).

Almost surely, 2^5611721 is an apocalyptic number.

It is an amenable number.

5611721 is a deficient number, since it is larger than the sum of its proper divisors (1).

5611721 is an equidigital number, since it uses as much as digits as its factorization.

5611721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 420, while the sum is 23.

The square root of 5611721 is about 2368.9071319915. The cubic root of 5611721 is about 177.7046083296.

Adding to 5611721 its reverse (1271165), we get a palindrome (6882886).

The spelling of 5611721 in words is "five million, six hundred eleven thousand, seven hundred twenty-one".