71163945 has 12 divisors (see below), whose sum is σ = 123350916. Its totient is φ = 37954080.

The previous prime is 71163929. The next prime is 71163979. The reversal of 71163945 is 54936117.

71163945 is a `hidden beast` number, since 7 + 11 + 639 + 4 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 31775769 + 39388176 = 5637^2 + 6276^2 .

It is not a de Polignac number, because 71163945 - 2⁴ = 71163929 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 790666 + ... + 790755.

It is an arithmetic number, because the mean of its divisors is an integer number (10279243).

Almost surely, 2^71163945 is an apocalyptic number.

It is an amenable number.

71163945 is a deficient number, since it is larger than the sum of its proper divisors (52186971).

71163945 is a wasteful number, since it uses less digits than its factorization.

71163945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1581432 (or 1581429 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 71163945 is about 8435.8725097052. The cubic root of 71163945 is about 414.4002465457.

The spelling of 71163945 in words is "seventy-one million, one hundred sixty-three thousand, nine hundred forty-five".