71311745 has 16 divisors (see below), whose sum is σ = 87442320. Its totient is φ = 55814400.

The previous prime is 71311739. The next prime is 71311771. The reversal of 71311745 is 54711317.

It can be written as a sum of positive squares in 8 ways, for example, as 364816 + 70946929 = 604^2 + 8423^2 .

It is not a de Polignac number, because 71311745 - 2⁸ = 71311489 is a prime.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69335 + ... + 70355.

It is an arithmetic number, because the mean of its divisors is an integer number (5465145).

Almost surely, 2^71311745 is an apocalyptic number.

It is an amenable number.

71311745 is a deficient number, since it is larger than the sum of its proper divisors (16130575).

71311745 is a wasteful number, since it uses less digits than its factorization.

71311745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1316.

The product of its digits is 2940, while the sum is 29.

The square root of 71311745 is about 8444.6281741708. The cubic root of 71311745 is about 414.6869366815.

The spelling of 71311745 in words is "seventy-one million, three hundred eleven thousand, seven hundred forty-five".