2179609561 has 2 divisors, whose sum is σ = 2179609562. Its totient is φ = 2179609560.

The previous prime is 2179609519. The next prime is 2179609591. The reversal of 2179609561 is 1659069712.

2179609561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1925015625 + 254593936 = 43875^2 + 15956^2 .

It is a cyclic number.

It is not a de Polignac number, because 2179609561 - 2¹⁹ = 2179085273 is a prime.

It is a super-2 number, since 2×2179609561² = 9501395676805225442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2179609591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1089804780 + 1089804781.

It is an arithmetic number, because the mean of its divisors is an integer number (1089804781).

Almost surely, 2^2179609561 is an apocalyptic number.

It is an amenable number.

2179609561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2179609561 is an equidigital number, since it uses as much as digits as its factorization.

2179609561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 46.

The square root of 2179609561 is about 46686.2887901791. The cubic root of 2179609561 is about 1296.5608428501.

The spelling of 2179609561 in words is "two billion, one hundred seventy-nine million, six hundred nine thousand, five hundred sixty-one".