204857969 has 2 divisors, whose sum is σ = 204857970. Its totient is φ = 204857968.

The previous prime is 204857959. The next prime is 204857999. The reversal of 204857969 is 969758402.

It is a happy number.

204857969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204118369 + 739600 = 14287^2 + 860^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204857969 is a prime.

It is a super-2 number, since 2×204857969² = 83933574925609922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (204857959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102428984 + 102428985.

It is an arithmetic number, because the mean of its divisors is an integer number (102428985).

Almost surely, 2^204857969 is an apocalyptic number.

It is an amenable number.

204857969 is a deficient number, since it is larger than the sum of its proper divisors (1).

204857969 is an equidigital number, since it uses as much as digits as its factorization.

204857969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The square root of 204857969 is about 14312.8602662081. The cubic root of 204857969 is about 589.5006490209.

The spelling of 204857969 in words is "two hundred four million, eight hundred fifty-seven thousand, nine hundred sixty-nine".