204111681 has 8 divisors (see below), whose sum is σ = 276211104. Its totient is φ = 134043360.

The previous prime is 204111679. The next prime is 204111689. The reversal of 204111681 is 186111402.

204111681 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 not a de Polignac number, because 204111681 - 2¹ = 204111679 is a prime.

It is a super-2 number, since 2×204111681² = 83323156641291522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (204111689) 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, 507540 + ... + 507941.

It is an arithmetic number, because the mean of its divisors is an integer number (34526388).

Almost surely, 2^204111681 is an apocalyptic number.

It is an amenable number.

204111681 is a deficient number, since it is larger than the sum of its proper divisors (72099423).

204111681 is a wasteful number, since it uses less digits than its factorization.

204111681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015551.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 204111681 is about 14286.7659391480. The cubic root of 204111681 is about 588.7839369009.

The spelling of 204111681 in words is "two hundred four million, one hundred eleven thousand, six hundred eighty-one".