261746 has 4 divisors (see below), whose sum is σ = 392622. Its totient is φ = 130872.

The previous prime is 261739. The next prime is 261757. The reversal of 261746 is 647162.

261746 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 647162 = 2 ⋅323581.

It can be written as a sum of positive squares in only one way, i.e., 261121 + 625 = 511^2 + 25^2 .

It is a Curzon number.

It is an unprimeable number.

261746 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 65435 + ... + 65438.

2²⁶¹⁷⁴⁶ is an apocalyptic number.

261746 is a deficient number, since it is larger than the sum of its proper divisors (130876).

261746 is a wasteful number, since it uses less digits than its factorization.

261746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130875.

The product of its digits is 2016, while the sum is 26.

The square root of 261746 is about 511.6111804877. The cubic root of 261746 is about 63.9675942716.

The spelling of 261746 in words is "two hundred sixty-one thousand, seven hundred forty-six".