2113543561 has 2 divisors, whose sum is σ = 2113543562. Its totient is φ = 2113543560.

The previous prime is 2113543529. The next prime is 2113543583. The reversal of 2113543561 is 1653453112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1105163536 + 1008380025 = 33244^2 + 31755^2 .

It is a cyclic number.

It is not a de Polignac number, because 2113543561 - 2⁵ = 2113543529 is a prime.

It is not a weakly prime, because it can be changed into another prime (2113543591) 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, 1056771780 + 1056771781.

It is an arithmetic number, because the mean of its divisors is an integer number (1056771781).

Almost surely, 2^2113543561 is an apocalyptic number.

It is an amenable number.

2113543561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2113543561 is an equidigital number, since it uses as much as digits as its factorization.

2113543561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 31.

The square root of 2113543561 is about 45973.2918225354. The cubic root of 2113543561 is about 1283.3262205861.

Adding to 2113543561 its reverse (1653453112), we get a palindrome (3766996673).

The spelling of 2113543561 in words is "two billion, one hundred thirteen million, five hundred forty-three thousand, five hundred sixty-one".