2541421661 has 2 divisors, whose sum is σ = 2541421662. Its totient is φ = 2541421660.

The previous prime is 2541421621. The next prime is 2541421721. The reversal of 2541421661 is 1661241452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2492505625 + 48916036 = 49925^2 + 6994^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2541421661 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2541421601) 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, 1270710830 + 1270710831.

It is an arithmetic number, because the mean of its divisors is an integer number (1270710831).

Almost surely, 2^2541421661 is an apocalyptic number.

It is an amenable number.

2541421661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2541421661 is an equidigital number, since it uses as much as digits as its factorization.

2541421661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 32.

The square root of 2541421661 is about 50412.5149243717. The cubic root of 2541421661 is about 1364.6634996401.

The spelling of 2541421661 in words is "two billion, five hundred forty-one million, four hundred twenty-one thousand, six hundred sixty-one".