71971523 has 32 divisors (see below), whose sum is σ = 86365440. Its totient is φ = 59704320.

The previous prime is 71971511. The next prime is 71971567. The reversal of 71971523 is 32517917.

It is a happy number.

It is not a de Polignac number, because 71971523 - 2⁴ = 71971507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71971423) 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 31 ways as a sum of consecutive naturals, for example, 1531286 + ... + 1531332.

It is an arithmetic number, because the mean of its divisors is an integer number (2698920).

Almost surely, 2^71971523 is an apocalyptic number.

71971523 is a deficient number, since it is larger than the sum of its proper divisors (14393917).

71971523 is a wasteful number, since it uses less digits than its factorization.

71971523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144 (or 118 counting only the distinct ones).

The product of its digits is 13230, while the sum is 35.

The square root of 71971523 is about 8483.6031849680. The cubic root of 71971523 is about 415.9619105751.

The spelling of 71971523 in words is "seventy-one million, nine hundred seventy-one thousand, five hundred twenty-three".