271981 has 2 divisors, whose sum is σ = 271982. Its totient is φ = 271980.

The previous prime is 271969. The next prime is 272003. The reversal of 271981 is 189172.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 260100 + 11881 = 510^2 + 109^2 .

It is a cyclic number.

It is not a de Polignac number, because 271981 - 2⁷ = 271853 is a prime.

It is a super-2 number, since 2×271981² = 147947328722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (271181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 135990 + 135991.

It is an arithmetic number, because the mean of its divisors is an integer number (135991).

2²⁷¹⁹⁸¹ is an apocalyptic number.

It is an amenable number.

271981 is a deficient number, since it is larger than the sum of its proper divisors (1).

271981 is an equidigital number, since it uses as much as digits as its factorization.

271981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 28.

The square root of 271981 is about 521.5179766796. The cubic root of 271981 is about 64.7907273477.

Subtracting from 271981 its sum of digits (28), we obtain a triangular number (271953 = T₇₃₇).

The spelling of 271981 in words is "two hundred seventy-one thousand, nine hundred eighty-one".