206556541 has 4 divisors (see below), whose sum is σ = 206752284. Its totient is φ = 206360800.

The previous prime is 206556527. The next prime is 206556547. The reversal of 206556541 is 145655602.

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

It can be written as a sum of positive squares in 2 ways, for example, as 60388441 + 146168100 = 7771^2 + 12090^2 .

It is a cyclic number.

It is not a de Polignac number, because 206556541 - 2⁹ = 206556029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 206556497 and 206556506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206556547) 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, 96280 + ... + 98401.

It is an arithmetic number, because the mean of its divisors is an integer number (51688071).

Almost surely, 2^206556541 is an apocalyptic number.

It is an amenable number.

206556541 is a deficient number, since it is larger than the sum of its proper divisors (195743).

206556541 is a wasteful number, since it uses less digits than its factorization.

206556541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195742.

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 206556541 is about 14372.0750415519. The cubic root of 206556541 is about 591.1254406426.

The spelling of 206556541 in words is "two hundred six million, five hundred fifty-six thousand, five hundred forty-one".