81371 has 2 divisors, whose sum is σ = 81372. Its totient is φ = 81370.

The previous prime is 81359. The next prime is 81373. The reversal of 81371 is 17318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81371 - 2⁶ = 81307 is a prime.

Together with 81373, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40685 + 40686.

It is an arithmetic number, because the mean of its divisors is an integer number (40686).

2⁸¹³⁷¹ is an apocalyptic number.

81371 is a deficient number, since it is larger than the sum of its proper divisors (1).

81371 is an equidigital number, since it uses as much as digits as its factorization.

81371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 168, while the sum is 20.

The square root of 81371 is about 285.2560253527. The cubic root of 81371 is about 43.3334451016. Note that the first 3 decimals are identical.

Adding to 81371 its reverse (17318), we get a palindrome (98689).

The spelling of 81371 in words is "eighty-one thousand, three hundred seventy-one".