275981 has 2 divisors, whose sum is σ = 275982. Its totient is φ = 275980.

The previous prime is 275969. The next prime is 275987. The reversal of 275981 is 189572.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 259081 + 16900 = 509^2 + 130^2 .

It is a cyclic number.

It is not a de Polignac number, because 275981 - 2⁶ = 275917 is a prime.

It is a super-2 number, since 2×275981² = 152331024722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (275987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137990 + 137991.

It is an arithmetic number, because the mean of its divisors is an integer number (137991).

2²⁷⁵⁹⁸¹ is an apocalyptic number.

It is an amenable number.

275981 is a deficient number, since it is larger than the sum of its proper divisors (1).

275981 is an equidigital number, since it uses as much as digits as its factorization.

275981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 32.

The square root of 275981 is about 525.3389382104. The cubic root of 275981 is about 65.1068066499.

The spelling of 275981 in words is "two hundred seventy-five thousand, nine hundred eighty-one".