115561543 has 2 divisors, whose sum is σ = 115561544. Its totient is φ = 115561542.

The previous prime is 115561541. The next prime is 115561561. The reversal of 115561543 is 345165511.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 115561543 - 2¹ = 115561541 is a prime.

Together with 115561541, 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 (115561541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57780771 + 57780772.

It is an arithmetic number, because the mean of its divisors is an integer number (57780772).

Almost surely, 2^115561543 is an apocalyptic number.

115561543 is a deficient number, since it is larger than the sum of its proper divisors (1).

115561543 is an equidigital number, since it uses as much as digits as its factorization.

115561543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9000, while the sum is 31.

The square root of 115561543 is about 10749.9554882799. The cubic root of 115561543 is about 487.0846506503.

The spelling of 115561543 in words is "one hundred fifteen million, five hundred sixty-one thousand, five hundred forty-three".