71503971431 has 4 divisors (see below), whose sum is σ = 71619861792. Its totient is φ = 71388081072.

The previous prime is 71503971359. The next prime is 71503971523. The reversal of 71503971431 is 13417930517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13417930517 = 151 ⋅88860467.

It is a cyclic number.

It is not a de Polignac number, because 71503971431 - 2¹⁰ = 71503970407 is a prime.

It is a super-2 number, since 2×71503971431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71503271431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57944255 + ... + 57945488.

It is an arithmetic number, because the mean of its divisors is an integer number (17904965448).

Almost surely, 2^71503971431 is an apocalyptic number.

71503971431 is a deficient number, since it is larger than the sum of its proper divisors (115890361).

71503971431 is a wasteful number, since it uses less digits than its factorization.

71503971431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115890360.

The product of its (nonzero) digits is 79380, while the sum is 41.

The spelling of 71503971431 in words is "seventy-one billion, five hundred three million, nine hundred seventy-one thousand, four hundred thirty-one".