71531811423 has 20 divisors (see below), whose sum is σ = 110540861640. Its totient is φ = 46043463312.

The previous prime is 71531811391. The next prime is 71531811431. The reversal of 71531811423 is 32411813517.

71531811423 is a `hidden beast` number, since 7 + 1 + 53 + 181 + 1 + 423 = 666.

It is not a de Polignac number, because 71531811423 - 2⁵ = 71531811391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71531811433) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15223665 + ... + 15228362.

It is an arithmetic number, because the mean of its divisors is an integer number (5527043082).

Almost surely, 2^71531811423 is an apocalyptic number.

71531811423 is a deficient number, since it is larger than the sum of its proper divisors (39009050217).

71531811423 is a wasteful number, since it uses less digits than its factorization.

71531811423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30452068 (or 30452059 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The spelling of 71531811423 in words is "seventy-one billion, five hundred thirty-one million, eight hundred eleven thousand, four hundred twenty-three".