71945 has 4 divisors (see below), whose sum is σ = 86340. Its totient is φ = 57552.

The previous prime is 71941. The next prime is 71947. The reversal of 71945 is 54917.

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

It can be written as a sum of positive squares in 2 ways, for example, as 23104 + 48841 = 152^2 + 221^2 .

It is a cyclic number.

It is not a de Polignac number, because 71945 - 2² = 71941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71941) 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, 7190 + ... + 7199.

It is an arithmetic number, because the mean of its divisors is an integer number (21585).

2⁷¹⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

71945 is a deficient number, since it is larger than the sum of its proper divisors (14395).

71945 is a wasteful number, since it uses less digits than its factorization.

71945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14394.

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

The square root of 71945 is about 268.2256512715. The cubic root of 71945 is about 41.5910807431.

The spelling of 71945 in words is "seventy-one thousand, nine hundred forty-five".