71549 has 2 divisors, whose sum is σ = 71550. Its totient is φ = 71548.

The previous prime is 71537. The next prime is 71551. The reversal of 71549 is 94517.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47524 + 24025 = 218^2 + 155^2 .

It is a cyclic number.

It is not a de Polignac number, because 71549 - 2⁸ = 71293 is a prime.

Together with 71551, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35774 + 35775.

It is an arithmetic number, because the mean of its divisors is an integer number (35775).

2⁷¹⁵⁴⁹ is an apocalyptic number.

It is an amenable number.

71549 is a deficient number, since it is larger than the sum of its proper divisors (1).

71549 is an equidigital number, since it uses as much as digits as its factorization.

71549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1260, while the sum is 26.

The square root of 71549 is about 267.4864482549. The cubic root of 71549 is about 41.5146317014.

The spelling of 71549 in words is "seventy-one thousand, five hundred forty-nine".