71551 has 2 divisors, whose sum is σ = 71552. Its totient is φ = 71550.

The previous prime is 71549. The next prime is 71563. The reversal of 71551 is 15517.

71551 is nontrivially palindromic in base 6.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71551 - 2¹ = 71549 is a prime.

Together with 71549, it forms a pair of twin primes.

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 (72551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35775 + 35776.

It is an arithmetic number, because the mean of its divisors is an integer number (35776).

2⁷¹⁵⁵¹ is an apocalyptic number.

71551 is a deficient number, since it is larger than the sum of its proper divisors (1).

71551 is an equidigital number, since it uses as much as digits as its factorization.

71551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 175, while the sum is 19.

The square root of 71551 is about 267.4901867359. The cubic root of 71551 is about 41.5150185155.

The spelling of 71551 in words is "seventy-one thousand, five hundred fifty-one".