261275 has 12 divisors (see below), whose sum is σ = 370512. Its totient is φ = 179040.

The previous prime is 261271. The next prime is 261281. The reversal of 261275 is 572162.

261275 is nontrivially palindromic in base 6.

It is not a de Polignac number, because 261275 - 2² = 261271 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 261275.

It is not an unprimeable number, because it can be changed into a prime (261271) 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 11 ways as a sum of consecutive naturals, for example, 572 + ... + 921.

It is an arithmetic number, because the mean of its divisors is an integer number (30876).

2²⁶¹²⁷⁵ is an apocalyptic number.

261275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

261275 is a deficient number, since it is larger than the sum of its proper divisors (109237).

261275 is a wasteful number, since it uses less digits than its factorization.

261275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1510 (or 1505 counting only the distinct ones).

The product of its digits is 840, while the sum is 23.

The square root of 261275 is about 511.1506627209. The cubic root of 261275 is about 63.9292023104.

The spelling of 261275 in words is "two hundred sixty-one thousand, two hundred seventy-five".