1211042543 has 8 divisors (see below), whose sum is σ = 1244826576. Its totient is φ = 1177460800.

The previous prime is 1211042537. The next prime is 1211042603. The reversal of 1211042543 is 3452401121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211042543 - 2¹⁰ = 1211041519 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 (1211042533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38393 + ... + 62418.

It is an arithmetic number, because the mean of its divisors is an integer number (155603322).

Almost surely, 2^1211042543 is an apocalyptic number.

1211042543 is a deficient number, since it is larger than the sum of its proper divisors (33784033).

1211042543 is a wasteful number, since it uses less digits than its factorization.

1211042543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101145.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1211042543 is about 34800.0365373371. The cubic root of 1211042543 is about 1065.9081919298.

Adding to 1211042543 its reverse (3452401121), we get a palindrome (4663443664).

The spelling of 1211042543 in words is "one billion, two hundred eleven million, forty-two thousand, five hundred forty-three".