261795 has 16 divisors (see below), whose sum is σ = 433152. Its totient is φ = 134880.

The previous prime is 261791. The next prime is 261799. The reversal of 261795 is 597162.

It is an interprime number because it is at equal distance from previous prime (261791) and next prime (261799).

It is not a de Polignac number, because 261795 - 2² = 261791 is a prime.

261795 is a lucky number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (261791) 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 15 ways as a sum of consecutive naturals, for example, 184 + ... + 746.

It is an arithmetic number, because the mean of its divisors is an integer number (27072).

2²⁶¹⁷⁹⁵ is an apocalyptic number.

261795 is a deficient number, since it is larger than the sum of its proper divisors (171357).

261795 is a wasteful number, since it uses less digits than its factorization.

261795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602.

The product of its digits is 3780, while the sum is 30.

The square root of 261795 is about 511.6590661759. The cubic root of 261795 is about 63.9715856940.

The spelling of 261795 in words is "two hundred sixty-one thousand, seven hundred ninety-five".