71533971 has 12 divisors (see below), whose sum is σ = 105847560. Its totient is φ = 46525920.

The previous prime is 71533967. The next prime is 71533997. The reversal of 71533971 is 17933517.

It is not a de Polignac number, because 71533971 - 2² = 71533967 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71533921) 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 11 ways as a sum of consecutive naturals, for example, 96561 + ... + 97298.

It is an arithmetic number, because the mean of its divisors is an integer number (8820630).

Almost surely, 2^71533971 is an apocalyptic number.

71533971 is a deficient number, since it is larger than the sum of its proper divisors (34313589).

71533971 is a wasteful number, since it uses less digits than its factorization.

71533971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193906 (or 193903 counting only the distinct ones).

The product of its digits is 19845, while the sum is 36.

The square root of 71533971 is about 8457.7757714425. The cubic root of 71533971 is about 415.1172475606.

The spelling of 71533971 in words is "seventy-one million, five hundred thirty-three thousand, nine hundred seventy-one".