1197566543 has 4 divisors (see below), whose sum is σ = 1198793280. Its totient is φ = 1196339808.

The previous prime is 1197566471. The next prime is 1197566563. The reversal of 1197566543 is 3456657911.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1197566543 - 2²⁰ = 1196517967 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 (1197566563) 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, 611903 + ... + 613856.

It is an arithmetic number, because the mean of its divisors is an integer number (299698320).

Almost surely, 2^1197566543 is an apocalyptic number.

1197566543 is a deficient number, since it is larger than the sum of its proper divisors (1226737).

1197566543 is an equidigital number, since it uses as much as digits as its factorization.

1197566543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226736.

The product of its digits is 680400, while the sum is 47.

The square root of 1197566543 is about 34605.8744001651. The cubic root of 1197566543 is about 1061.9397681008.

The spelling of 1197566543 in words is "one billion, one hundred ninety-seven million, five hundred sixty-six thousand, five hundred forty-three".