31705030431 has 6 divisors (see below), whose sum is σ = 45796155080. Its totient is φ = 21136686948.

The previous prime is 31705030373. The next prime is 31705030457. The reversal of 31705030431 is 13403050713.

It is not a de Polignac number, because 31705030431 - 2⁹ = 31705029919 is a prime.

It is a super-2 number, since 2×31705030431² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31705030395 and 31705030404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31705040431) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1761390571 + ... + 1761390588.

Almost surely, 2^31705030431 is an apocalyptic number.

31705030431 is a deficient number, since it is larger than the sum of its proper divisors (14091124649).

31705030431 is a wasteful number, since it uses less digits than its factorization.

31705030431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3522781165 (or 3522781162 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 27.

The spelling of 31705030431 in words is "thirty-one billion, seven hundred five million, thirty thousand, four hundred thirty-one".