204161569 has 2 divisors, whose sum is σ = 204161570. Its totient is φ = 204161568.

The previous prime is 204161557. The next prime is 204161599. The reversal of 204161569 is 965161402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102252544 + 101909025 = 10112^2 + 10095^2 .

It is a cyclic number.

It is not a de Polignac number, because 204161569 - 2¹³ = 204153377 is a prime.

It is a super-2 number, since 2×204161569² = 83363892513083522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (204161539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102080784 + 102080785.

It is an arithmetic number, because the mean of its divisors is an integer number (102080785).

Almost surely, 2^204161569 is an apocalyptic number.

It is an amenable number.

204161569 is a deficient number, since it is larger than the sum of its proper divisors (1).

204161569 is an equidigital number, since it uses as much as digits as its factorization.

204161569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 204161569 is about 14288.5117839473. The cubic root of 204161569 is about 588.8319022437.

The spelling of 204161569 in words is "two hundred four million, one hundred sixty-one thousand, five hundred sixty-nine".