71131161 has 4 divisors (see below), whose sum is σ = 94841552. Its totient is φ = 47420772.

The previous prime is 71131133. The next prime is 71131189. The reversal of 71131161 is 16113117.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16113117 = 3 ⋅5371039.

It is an interprime number because it is at equal distance from previous prime (71131133) and next prime (71131189).

It is not a de Polignac number, because 71131161 - 2⁷ = 71131033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71131121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11855191 + ... + 11855196.

It is an arithmetic number, because the mean of its divisors is an integer number (23710388).

Almost surely, 2^71131161 is an apocalyptic number.

It is an amenable number.

71131161 is a deficient number, since it is larger than the sum of its proper divisors (23710391).

71131161 is a wasteful number, since it uses less digits than its factorization.

71131161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23710390.

The product of its digits is 126, while the sum is 21.

The square root of 71131161 is about 8433.9291555004. The cubic root of 71131161 is about 414.3366010932.

Adding to 71131161 its reverse (16113117), we get a palindrome (87244278).

It can be divided in two parts, 7113116 and 1, that added together give a palindrome (7113117).

The spelling of 71131161 in words is "seventy-one million, one hundred thirty-one thousand, one hundred sixty-one".