205112543 has 4 divisors (see below), whose sum is σ = 215907960. Its totient is φ = 194317128.

The previous prime is 205112521. The next prime is 205112549. The reversal of 205112543 is 345211502.

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 205112543 - 2¹⁴ = 205096159 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 (205112549) 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, 5397680 + ... + 5397717.

It is an arithmetic number, because the mean of its divisors is an integer number (53976990).

Almost surely, 2^205112543 is an apocalyptic number.

205112543 is a deficient number, since it is larger than the sum of its proper divisors (10795417).

205112543 is a wasteful number, since it uses less digits than its factorization.

205112543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10795416.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 205112543 is about 14321.7506960567. The cubic root of 205112543 is about 589.7447358842.

The spelling of 205112543 in words is "two hundred five million, one hundred twelve thousand, five hundred forty-three".