1181660543 has 4 divisors (see below), whose sum is σ = 1350469200. Its totient is φ = 1012851888.

The previous prime is 1181660539. The next prime is 1181660551. The reversal of 1181660543 is 3450661811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3450661811 = 50551 ⋅68261.

It is a cyclic number.

It is not a de Polignac number, because 1181660543 - 2² = 1181660539 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181660533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84404318 + ... + 84404331.

It is an arithmetic number, because the mean of its divisors is an integer number (337617300).

Almost surely, 2^1181660543 is an apocalyptic number.

1181660543 is a deficient number, since it is larger than the sum of its proper divisors (168808657).

1181660543 is an equidigital number, since it uses as much as digits as its factorization.

1181660543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168808656.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 1181660543 is about 34375.2897151428. The cubic root of 1181660543 is about 1057.2172599282.

It can be divided in two parts, 118 and 1660543, that added together give a palindrome (1660661).

The spelling of 1181660543 in words is "one billion, one hundred eighty-one million, six hundred sixty thousand, five hundred forty-three".