261344 has 12 divisors (see below), whose sum is σ = 514584. Its totient is φ = 130656.

The previous prime is 261337. The next prime is 261347. The reversal of 261344 is 443162.

It is a happy number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4052 + ... + 4115.

It is an arithmetic number, because the mean of its divisors is an integer number (42882).

2²⁶¹³⁴⁴ is an apocalyptic number.

It is an amenable number.

261344 is a deficient number, since it is larger than the sum of its proper divisors (253240).

261344 is an equidigital number, since it uses as much as digits as its factorization.

261344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8177 (or 8169 counting only the distinct ones).

The product of its digits is 576, while the sum is 20.

The square root of 261344 is about 511.2181530423. The cubic root of 261344 is about 63.9348294934.

The spelling of 261344 in words is "two hundred sixty-one thousand, three hundred forty-four".