71231211 has 16 divisors (see below), whose sum is σ = 108933120. Its totient is φ = 45955080.

The previous prime is 71231203. The next prime is 71231233. The reversal of 71231211 is 11213217.

It is a happy number.

It is not a de Polignac number, because 71231211 - 2³ = 71231203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71231201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41715 + ... + 43388.

It is an arithmetic number, because the mean of its divisors is an integer number (6808320).

Almost surely, 2^71231211 is an apocalyptic number.

71231211 is a deficient number, since it is larger than the sum of its proper divisors (37701909).

71231211 is a wasteful number, since it uses less digits than its factorization.

71231211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85143 (or 85137 counting only the distinct ones).

The product of its digits is 84, while the sum is 18.

The square root of 71231211 is about 8439.8584703773. The cubic root of 71231211 is about 414.5307727031.

Adding to 71231211 its reverse (11213217), we get a palindrome (82444428).

The spelling of 71231211 in words is "seventy-one million, two hundred thirty-one thousand, two hundred eleven".