71145385 has 16 divisors (see below), whose sum is σ = 86480784. Its totient is φ = 56184832.

The previous prime is 71145379. The next prime is 71145401. The reversal of 71145385 is 58354117.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 97344 + 71048041 = 312^2 + 8429^2 .

It is a cyclic number.

It is not a de Polignac number, because 71145385 - 2¹⁹ = 70621097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71145385.

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, 201369 + ... + 201721.

It is an arithmetic number, because the mean of its divisors is an integer number (5405049).

Almost surely, 2^71145385 is an apocalyptic number.

It is an amenable number.

71145385 is a deficient number, since it is larger than the sum of its proper divisors (15335399).

71145385 is a wasteful number, since it uses less digits than its factorization.

71145385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764.

The product of its digits is 16800, while the sum is 34.

The square root of 71145385 is about 8434.7723739292. The cubic root of 71145385 is about 414.3642173584.

The spelling of 71145385 in words is "seventy-one million, one hundred forty-five thousand, three hundred eighty-five".