206557441 has 4 divisors (see below), whose sum is σ = 206641584. Its totient is φ = 206473300.

The previous prime is 206557427. The next prime is 206557447. The reversal of 206557441 is 144755602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 144755602 = 2 ⋅72377801.

It is a cyclic number.

It is not a de Polignac number, because 206557441 - 2⁹ = 206556929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 206557397 and 206557406.

It is not an unprimeable number, because it can be changed into a prime (206557447) 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, 38275 + ... + 43336.

It is an arithmetic number, because the mean of its divisors is an integer number (51660396).

Almost surely, 2^206557441 is an apocalyptic number.

It is an amenable number.

206557441 is a deficient number, since it is larger than the sum of its proper divisors (84143).

206557441 is an equidigital number, since it uses as much as digits as its factorization.

206557441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84142.

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 206557441 is about 14372.1063522366. The cubic root of 206557441 is about 591.1262991841.

The spelling of 206557441 in words is "two hundred six million, five hundred fifty-seven thousand, four hundred forty-one".