2546987561 has 2 divisors, whose sum is σ = 2546987562. Its totient is φ = 2546987560.

The previous prime is 2546987507. The next prime is 2546987581. The reversal of 2546987561 is 1657896452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2518032400 + 28955161 = 50180^2 + 5381^2 .

It is a cyclic number.

It is not a de Polignac number, because 2546987561 - 2²² = 2542793257 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2546987581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1273493780 + 1273493781.

It is an arithmetic number, because the mean of its divisors is an integer number (1273493781).

Almost surely, 2^2546987561 is an apocalyptic number.

It is an amenable number.

2546987561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2546987561 is an equidigital number, since it uses as much as digits as its factorization.

2546987561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3628800, while the sum is 53.

The square root of 2546987561 is about 50467.6882866652. The cubic root of 2546987561 is about 1365.6590109933.

The spelling of 2546987561 in words is "two billion, five hundred forty-six million, nine hundred eighty-seven thousand, five hundred sixty-one".