275661 has 12 divisors (see below), whose sum is σ = 403260. Its totient is φ = 181440.

The previous prime is 275657. The next prime is 275669. The reversal of 275661 is 166572.

It can be written as a sum of positive squares in 2 ways, for example, as 189225 + 86436 = 435^2 + 294^2 .

It is not a de Polignac number, because 275661 - 2² = 275657 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 275661.

It is not an unprimeable number, because it can be changed into a prime (275669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 841 + ... + 1121.

It is an arithmetic number, because the mean of its divisors is an integer number (33605).

2²⁷⁵⁶⁶¹ is an apocalyptic number.

275661 is the 281-st nonagonal number.

It is an amenable number.

275661 is a deficient number, since it is larger than the sum of its proper divisors (127599).

275661 is a wasteful number, since it uses less digits than its factorization.

275661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396 (or 393 counting only the distinct ones).

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

The square root of 275661 is about 525.0342845948. The cubic root of 275661 is about 65.0816331347.

The spelling of 275661 in words is "two hundred seventy-five thousand, six hundred sixty-one".