2601361561 has 2 divisors, whose sum is σ = 2601361562. Its totient is φ = 2601361560.

The previous prime is 2601361519. The next prime is 2601361577. The reversal of 2601361561 is 1651631062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1601600400 + 999761161 = 40020^2 + 31619^2 .

It is a cyclic number.

It is not a de Polignac number, because 2601361561 - 2²⁵ = 2567807129 is a prime.

It is not a weakly prime, because it can be changed into another prime (2601361591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1300680780 + 1300680781.

It is an arithmetic number, because the mean of its divisors is an integer number (1300680781).

Almost surely, 2^2601361561 is an apocalyptic number.

It is an amenable number.

2601361561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2601361561 is an equidigital number, since it uses as much as digits as its factorization.

2601361561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 2601361561 is about 51003.5445925085. The cubic root of 2601361561 is about 1375.3088559742.

The spelling of 2601361561 in words is "two billion, six hundred one million, three hundred sixty-one thousand, five hundred sixty-one".