261546 has 8 divisors (see below), whose sum is σ = 523104. Its totient is φ = 87180.

The previous prime is 261529. The next prime is 261557. The reversal of 261546 is 645162.

It is a sphenic number, since it is the product of 3 distinct primes.

261546 is an admirable number.

It is a Curzon number.

It is a nialpdrome in base 8.

It is an unprimeable 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 in 3 ways as a sum of consecutive naturals, for example, 21790 + ... + 21801.

It is an arithmetic number, because the mean of its divisors is an integer number (65388).

2²⁶¹⁵⁴⁶ is an apocalyptic number.

261546 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261546 is a wasteful number, since it uses less digits than its factorization.

261546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43596.

The product of its digits is 1440, while the sum is 24.

The square root of 261546 is about 511.4156821999. The cubic root of 261546 is about 63.9512975835.

The spelling of 261546 in words is "two hundred sixty-one thousand, five hundred forty-six".