204183981 has 12 divisors (see below), whose sum is σ = 295261980. Its totient is φ = 135970560.

The previous prime is 204183971. The next prime is 204183997. The reversal of 204183981 is 189381402.

It can be written as a sum of positive squares in 2 ways, for example, as 1121481 + 203062500 = 1059^2 + 14250^2 .

It is not a de Polignac number, because 204183981 - 2⁷ = 204183853 is a prime.

It is a super-2 number, since 2×204183981² = 83382196194016722, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204183971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3850 + ... + 20571.

It is an arithmetic number, because the mean of its divisors is an integer number (24605165).

Almost surely, 2^204183981 is an apocalyptic number.

It is an amenable number.

204183981 is a deficient number, since it is larger than the sum of its proper divisors (91077999).

204183981 is a wasteful number, since it uses less digits than its factorization.

204183981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25356 (or 25353 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 204183981 is about 14289.2960288462. The cubic root of 204183981 is about 588.8534479535.

The spelling of 204183981 in words is "two hundred four million, one hundred eighty-three thousand, nine hundred eighty-one".