2611171721 has 2 divisors, whose sum is σ = 2611171722. Its totient is φ = 2611171720.

The previous prime is 2611171699. The next prime is 2611171741. The reversal of 2611171721 is 1271711162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2523655696 + 87516025 = 50236^2 + 9355^2 .

It is a cyclic number.

It is not a de Polignac number, because 2611171721 - 2¹⁸ = 2610909577 is a prime.

It is not a weakly prime, because it can be changed into another prime (2611171741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1305585860 + 1305585861.

It is an arithmetic number, because the mean of its divisors is an integer number (1305585861).

Almost surely, 2^2611171721 is an apocalyptic number.

It is an amenable number.

2611171721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2611171721 is an equidigital number, since it uses as much as digits as its factorization.

2611171721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1176, while the sum is 29.

The square root of 2611171721 is about 51099.6254487252. The cubic root of 2611171721 is about 1377.0355254989.

Adding to 2611171721 its reverse (1271711162), we get a palindrome (3882882883).

The spelling of 2611171721 in words is "two billion, six hundred eleven million, one hundred seventy-one thousand, seven hundred twenty-one".