20541241261 has 2 divisors, whose sum is σ = 20541241262. Its totient is φ = 20541241260.

The previous prime is 20541241241. The next prime is 20541241319. The reversal of 20541241261 is 16214214502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17447768100 + 3093473161 = 132090^2 + 55619^2 .

It is a cyclic number.

It is not a de Polignac number, because 20541241261 - 2¹⁷ = 20541110189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20541241211) 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, 10270620630 + 10270620631.

It is an arithmetic number, because the mean of its divisors is an integer number (10270620631).

Almost surely, 2^20541241261 is an apocalyptic number.

It is an amenable number.

20541241261 is a deficient number, since it is larger than the sum of its proper divisors (1).

20541241261 is an equidigital number, since it uses as much as digits as its factorization.

20541241261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 28.

Adding to 20541241261 its reverse (16214214502), we get a palindrome (36755455763).

The spelling of 20541241261 in words is "twenty billion, five hundred forty-one million, two hundred forty-one thousand, two hundred sixty-one".