261305469 has 6 divisors (see below), whose sum is σ = 377441246. Its totient is φ = 174203640.

The previous prime is 261305459. The next prime is 261305501. The reversal of 261305469 is 964503162.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 149157369 + 112148100 = 12213^2 + 10590^2 .

It is not a de Polignac number, because 261305469 - 2⁵ = 261305437 is a prime.

It is a super-2 number, since 2×261305469² = 136561096258619922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261305459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14516962 + ... + 14516979.

Almost surely, 2^261305469 is an apocalyptic number.

It is an amenable number.

261305469 is a deficient number, since it is larger than the sum of its proper divisors (116135777).

261305469 is a wasteful number, since it uses less digits than its factorization.

261305469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29033947 (or 29033944 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 261305469 is about 16164.9456850309. The cubic root of 261305469 is about 639.3168728242.

The spelling of 261305469 in words is "two hundred sixty-one million, three hundred five thousand, four hundred sixty-nine".