71165945 has 4 divisors (see below), whose sum is σ = 85399140. Its totient is φ = 56932752.

The previous prime is 71165929. The next prime is 71165947. The reversal of 71165945 is 54956117.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54956117 = 149 ⋅368833.

It can be written as a sum of positive squares in 2 ways, for example, as 12475024 + 58690921 = 3532^2 + 7661^2 .

It is a cyclic number.

It is not a de Polignac number, because 71165945 - 2⁴ = 71165929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71165899 and 71165908.

It is not an unprimeable number, because it can be changed into a prime (71165947) 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, 7116590 + ... + 7116599.

It is an arithmetic number, because the mean of its divisors is an integer number (21349785).

Almost surely, 2^71165945 is an apocalyptic number.

It is an amenable number.

71165945 is a deficient number, since it is larger than the sum of its proper divisors (14233195).

71165945 is a wasteful number, since it uses less digits than its factorization.

71165945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14233194.

The product of its digits is 37800, while the sum is 38.

The square root of 71165945 is about 8435.9910502560. The cubic root of 71165945 is about 414.4041286273.

The spelling of 71165945 in words is "seventy-one million, one hundred sixty-five thousand, nine hundred forty-five".