261465 has 8 divisors (see below), whose sum is σ = 418368. Its totient is φ = 139440.

The previous prime is 261463. The next prime is 261467. The reversal of 261465 is 564162.

It is an interprime number because it is at equal distance from previous prime (261463) and next prime (261467).

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

It is not a de Polignac number, because 261465 - 2¹ = 261463 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a nialpdrome in base 8.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 261465.

It is not an unprimeable number, because it can be changed into a prime (261463) 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 7 ways as a sum of consecutive naturals, for example, 8701 + ... + 8730.

It is an arithmetic number, because the mean of its divisors is an integer number (52296).

2²⁶¹⁴⁶⁵ is an apocalyptic number.

It is an amenable number.

261465 is a deficient number, since it is larger than the sum of its proper divisors (156903).

261465 is a wasteful number, since it uses less digits than its factorization.

261465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17439.

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

The square root of 261465 is about 511.3364841276. The cubic root of 261465 is about 63.9446950611.

The spelling of 261465 in words is "two hundred sixty-one thousand, four hundred sixty-five".