2517601721 has 2 divisors, whose sum is σ = 2517601722. Its totient is φ = 2517601720.

The previous prime is 2517601717. The next prime is 2517601739. The reversal of 2517601721 is 1271067152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2261953600 + 255648121 = 47560^2 + 15989^2 .

It is a cyclic number.

It is not a de Polignac number, because 2517601721 - 2² = 2517601717 is a prime.

It is not a weakly prime, because it can be changed into another prime (2517601741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1258800860 + 1258800861.

It is an arithmetic number, because the mean of its divisors is an integer number (1258800861).

Almost surely, 2^2517601721 is an apocalyptic number.

It is an amenable number.

2517601721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2517601721 is an equidigital number, since it uses as much as digits as its factorization.

2517601721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5880, while the sum is 32.

The square root of 2517601721 is about 50175.7084753170. The cubic root of 2517601721 is about 1360.3865901057.

Adding to 2517601721 its reverse (1271067152), we get a palindrome (3788668873).

The spelling of 2517601721 in words is "two billion, five hundred seventeen million, six hundred one thousand, seven hundred twenty-one".