71247 has 16 divisors (see below), whose sum is σ = 110592. Its totient is φ = 40320.

The previous prime is 71237. The next prime is 71249. The reversal of 71247 is 74217.

It is not a de Polignac number, because 71247 - 2⁷ = 71119 is a prime.

It is a super-2 number, since 2×71247² = 10152270018, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 498 + ... + 624.

It is an arithmetic number, because the mean of its divisors is an integer number (6912).

2⁷¹²⁴⁷ is an apocalyptic number.

71247 is a deficient number, since it is larger than the sum of its proper divisors (39345).

71247 is a wasteful number, since it uses less digits than its factorization.

71247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158.

The product of its digits is 392, while the sum is 21.

The square root of 71247 is about 266.9213367268. The cubic root of 71247 is about 41.4561398524.

The spelling of 71247 in words is "seventy-one thousand, two hundred forty-seven", and thus it is an iban number.