261343 has 4 divisors (see below), whose sum is σ = 266328. Its totient is φ = 256360.

The previous prime is 261337. The next prime is 261347. The reversal of 261343 is 343162.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261343 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261343.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2413 + ... + 2518.

It is an arithmetic number, because the mean of its divisors is an integer number (66582).

2²⁶¹³⁴³ is an apocalyptic number.

261343 is a deficient number, since it is larger than the sum of its proper divisors (4985).

261343 is an equidigital number, since it uses as much as digits as its factorization.

261343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4984.

The product of its digits is 432, while the sum is 19.

The square root of 261343 is about 511.2171749853. The cubic root of 261343 is about 63.9347479471.

It can be divided in two parts, 26 and 1343, that added together give a square (1369 = 37²).

The spelling of 261343 in words is "two hundred sixty-one thousand, three hundred forty-three".