204861969 has 27 divisors (see below), whose sum is σ = 321300603. Its totient is φ = 125725392.

The previous prime is 204861941. The next prime is 204861977. The reversal of 204861969 is 969168402.

It is a happy number.

The square root of 204861969 is 14313.

It is a perfect power (a square), and thus also a powerful number.

204861969 is a `hidden beast` number, since 20 + 4 + 8 + 619 + 6 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 30305025 + 174556944 = 5505^2 + 13212^2 .

It is not a de Polignac number, because 204861969 - 2⁷ = 204861841 is a prime.

It is a super-2 number, since 2×204861969² = 83936852685113922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (204861269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 558024 + ... + 558390.

Almost surely, 2^204861969 is an apocalyptic number.

204861969 is the 14313-rd square number.

204861969 is the 7157-th centered octagonal number.

It is an amenable number.

204861969 is a deficient number, since it is larger than the sum of its proper divisors (116438634).

204861969 is an equidigital number, since it uses as much as digits as its factorization.

204861969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766 (or 383 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The cubic root of 204861969 is about 589.5044858048.

Multiplying 204861969 by its product of nonzero digits (186624), we get a square (38232160102656 = 6183216²).

The spelling of 204861969 in words is "two hundred four million, eight hundred sixty-one thousand, nine hundred sixty-nine".