2541116581 has 2 divisors, whose sum is σ = 2541116582. Its totient is φ = 2541116580.

The previous prime is 2541116579. The next prime is 2541116603. The reversal of 2541116581 is 1856111452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2322372481 + 218744100 = 48191^2 + 14790^2 .

It is a cyclic number.

It is not a de Polignac number, because 2541116581 - 2¹ = 2541116579 is a prime.

It is a super-2 number, since 2×2541116581² = 12914546956466259122, which contains 22 as substring.

Together with 2541116579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2541116681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1270558290 + 1270558291.

It is an arithmetic number, because the mean of its divisors is an integer number (1270558291).

Almost surely, 2^2541116581 is an apocalyptic number.

It is an amenable number.

2541116581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2541116581 is an equidigital number, since it uses as much as digits as its factorization.

2541116581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9600, while the sum is 34.

The square root of 2541116581 is about 50409.4889976084. The cubic root of 2541116581 is about 1364.6088913334.

The spelling of 2541116581 in words is "two billion, five hundred forty-one million, one hundred sixteen thousand, five hundred eighty-one".