71165161 has 4 divisors (see below), whose sum is σ = 71416912. Its totient is φ = 70913412.

The previous prime is 71165141. The next prime is 71165173. The reversal of 71165161 is 16156117.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71165161 - 2¹⁵ = 71132393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71165141) 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, 125451 + ... + 126016.

It is an arithmetic number, because the mean of its divisors is an integer number (17854228).

Almost surely, 2^71165161 is an apocalyptic number.

It is an amenable number.

71165161 is a deficient number, since it is larger than the sum of its proper divisors (251751).

71165161 is a wasteful number, since it uses less digits than its factorization.

71165161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251750.

The product of its digits is 1260, while the sum is 28.

The square root of 71165161 is about 8435.9445825586. The cubic root of 71165161 is about 414.4026068600.

The spelling of 71165161 in words is "seventy-one million, one hundred sixty-five thousand, one hundred sixty-one".