71123 has 4 divisors (see below), whose sum is σ = 76608. Its totient is φ = 65640.

The previous prime is 71119. The next prime is 71129. The reversal of 71123 is 32117.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71123 - 2² = 71119 is a prime.

It is a super-2 number, since 2×71123² = 10116962258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71098 and 71107.

It is not an unprimeable number, because it can be changed into a prime (71129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2723 + ... + 2748.

It is an arithmetic number, because the mean of its divisors is an integer number (19152).

2⁷¹¹²³ is an apocalyptic number.

71123 is a deficient number, since it is larger than the sum of its proper divisors (5485).

71123 is a wasteful number, since it uses less digits than its factorization.

71123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5484.

The product of its digits is 42, while the sum is 14.

The square root of 71123 is about 266.6889574017. The cubic root of 71123 is about 41.4320754638.

The spelling of 71123 in words is "seventy-one thousand, one hundred twenty-three", and thus it is an iban number.