203680561 has 8 divisors (see below), whose sum is σ = 234914240. Its totient is φ = 172981008.

The previous prime is 203680559. The next prime is 203680573. The reversal of 203680561 is 165086302.

203680561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 203680561 - 2¹ = 203680559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203680501) 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, 132711 + ... + 134236.

It is an arithmetic number, because the mean of its divisors is an integer number (29364280).

Almost surely, 2^203680561 is an apocalyptic number.

It is an amenable number.

203680561 is a deficient number, since it is larger than the sum of its proper divisors (31233679).

203680561 is a wasteful number, since it uses less digits than its factorization.

203680561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267063.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 203680561 is about 14271.6698742649. The cubic root of 203680561 is about 588.3691060665.

The spelling of 203680561 in words is "two hundred three million, six hundred eighty thousand, five hundred sixty-one".