1165111543 has 2 divisors, whose sum is σ = 1165111544. Its totient is φ = 1165111542.

The previous prime is 1165111517. The next prime is 1165111603. The reversal of 1165111543 is 3451115611.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1165111543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1165111043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 582555771 + 582555772.

It is an arithmetic number, because the mean of its divisors is an integer number (582555772).

Almost surely, 2^1165111543 is an apocalyptic number.

1165111543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165111543 is an equidigital number, since it uses as much as digits as its factorization.

1165111543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 28.

The square root of 1165111543 is about 34133.7302825226. The cubic root of 1165111543 is about 1052.2586430392.

The spelling of 1165111543 in words is "one billion, one hundred sixty-five million, one hundred eleven thousand, five hundred forty-three".