205145469 has 12 divisors (see below), whose sum is σ = 296495836. Its totient is φ = 136683072.

The previous prime is 205145453. The next prime is 205145497. The reversal of 205145469 is 964541502.

It can be written as a sum of positive squares in 2 ways, for example, as 105884100 + 99261369 = 10290^2 + 9963^2 .

It is not a de Polignac number, because 205145469 - 2⁴ = 205145453 is a prime.

It is a super-2 number, since 2×205145469² = 84169326902459922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205143469) 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, 12219 + ... + 23655.

Almost surely, 2^205145469 is an apocalyptic number.

It is an amenable number.

205145469 is a deficient number, since it is larger than the sum of its proper divisors (91350367).

205145469 is a wasteful number, since it uses less digits than its factorization.

205145469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13436 (or 13433 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 205145469 is about 14322.9001602329. The cubic root of 205145469 is about 589.7762907499.

The spelling of 205145469 in words is "two hundred five million, one hundred forty-five thousand, four hundred sixty-nine".