276561 has 8 divisors (see below), whose sum is σ = 409760. Its totient is φ = 184356.

The previous prime is 276557. The next prime is 276581. The reversal of 276561 is 165672.

276561 is a `hidden beast` number, since 2 + 7 + 656 + 1 = 666.

It is not a de Polignac number, because 276561 - 2² = 276557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 10243 = 276561 / (2 + 7 + 6 + 5 + 6 + 1).

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 276561.

It is not an unprimeable number, because it can be changed into a prime (276581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5095 + ... + 5148.

It is an arithmetic number, because the mean of its divisors is an integer number (51220).

276561 is a Friedman number, since it can be written as 6^7-15^(6/2), using all its digits and the basic arithmetic operations.

2²⁷⁶⁵⁶¹ is an apocalyptic number.

It is an amenable number.

276561 is a deficient number, since it is larger than the sum of its proper divisors (133199).

276561 is a wasteful number, since it uses less digits than its factorization.

276561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10252 (or 10246 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 276561 is about 525.8906730491. The cubic root of 276561 is about 65.1523840934.

Subtracting from 276561 its reverse (165672), we obtain a square (110889 = 333²).

It can be divided in two parts, 27 and 6561, that multiplied together give a 11-th power (177147 = 3¹¹).

The spelling of 276561 in words is "two hundred seventy-six thousand, five hundred sixty-one".