261469 has 4 divisors (see below), whose sum is σ = 281596. Its totient is φ = 241344.

The previous prime is 261467. The next prime is 261509. The reversal of 261469 is 964162.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26244 + 235225 = 162^2 + 485^2 .

It is a cyclic number.

It is not a de Polignac number, because 261469 - 2¹ = 261467 is a prime.

It is a super-2 number, since 2×261469² = 136732075922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10044 + ... + 10069.

It is an arithmetic number, because the mean of its divisors is an integer number (70399).

2²⁶¹⁴⁶⁹ is an apocalyptic number.

It is an amenable number.

261469 is a deficient number, since it is larger than the sum of its proper divisors (20127).

261469 is a wasteful number, since it uses less digits than its factorization.

261469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20126.

The product of its digits is 2592, while the sum is 28.

The square root of 261469 is about 511.3403954315. The cubic root of 261469 is about 63.9450211436.

The spelling of 261469 in words is "two hundred sixty-one thousand, four hundred sixty-nine".