212740543 has 4 divisors (see below), whose sum is σ = 212774440. Its totient is φ = 212706648.

The previous prime is 212740531. The next prime is 212740553. The reversal of 212740543 is 345047212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212740543 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 (212740523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4473 + ... + 21106.

It is an arithmetic number, because the mean of its divisors is an integer number (53193610).

Almost surely, 2^212740543 is an apocalyptic number.

212740543 is a deficient number, since it is larger than the sum of its proper divisors (33897).

212740543 is an equidigital number, since it uses as much as digits as its factorization.

212740543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33896.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 212740543 is about 14585.6279604273. The cubic root of 212740543 is about 596.9666750008.

Adding to 212740543 its reverse (345047212), we get a palindrome (557787755).

The spelling of 212740543 in words is "two hundred twelve million, seven hundred forty thousand, five hundred forty-three".