261683 has 4 divisors (see below), whose sum is σ = 263568. Its totient is φ = 259800.

The previous prime is 261673. The next prime is 261697. The reversal of 261683 is 386162.

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

It is a cyclic number.

It is not a de Polignac number, because 261683 - 2⁶ = 261619 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (261643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 716 + ... + 1017.

It is an arithmetic number, because the mean of its divisors is an integer number (65892).

2²⁶¹⁶⁸³ is an apocalyptic number.

261683 is a deficient number, since it is larger than the sum of its proper divisors (1885).

261683 is a wasteful number, since it uses less digits than its factorization.

261683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1884.

The product of its digits is 1728, while the sum is 26.

The square root of 261683 is about 511.5496065877. The cubic root of 261683 is about 63.9624617107.

The spelling of 261683 in words is "two hundred sixty-one thousand, six hundred eighty-three".