275681 has 4 divisors (see below), whose sum is σ = 315072. Its totient is φ = 236292.

The previous prime is 275677. The next prime is 275699. The reversal of 275681 is 186572.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 275681 - 2² = 275677 is a prime.

It is a super-2 number, since 2×275681² = 152000027522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (275641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19685 + ... + 19698.

It is an arithmetic number, because the mean of its divisors is an integer number (78768).

275681 is a Friedman number, since it can be written as 1-8^6+(7*2)^5, using all its digits and the basic arithmetic operations.

2²⁷⁵⁶⁸¹ is an apocalyptic number.

It is an amenable number.

275681 is a deficient number, since it is larger than the sum of its proper divisors (39391).

275681 is an equidigital number, since it uses as much as digits as its factorization.

275681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39390.

The product of its digits is 3360, while the sum is 29.

The square root of 275681 is about 525.0533306246. The cubic root of 275681 is about 65.0832070500.

The spelling of 275681 in words is "two hundred seventy-five thousand, six hundred eighty-one".