71312 has 10 divisors (see below), whose sum is σ = 138198. Its totient is φ = 35648.

The previous prime is 71293. The next prime is 71317. The reversal of 71312 is 21317.

It can be written as a sum of positive squares in only one way, i.e., 65536 + 5776 = 256^2 + 76^2 .

It is not an unprimeable number, because it can be changed into a prime (71317) by changing a digit.

71312 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2213 + ... + 2244.

2⁷¹³¹² is an apocalyptic number.

It is an amenable number.

71312 is a deficient number, since it is larger than the sum of its proper divisors (66886).

71312 is a wasteful number, since it uses less digits than its factorization.

71312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4465 (or 4459 counting only the distinct ones).

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

The square root of 71312 is about 267.0430676876. The cubic root of 71312 is about 41.4687430967.

Adding to 71312 its reverse (21317), we get a palindrome (92629).

It can be divided in two parts, 71 and 312, that added together give a palindrome (383).

The spelling of 71312 in words is "seventy-one thousand, three hundred twelve", and thus it is an iban number.