31431000043 has 4 divisors (see below), whose sum is σ = 31452138720. Its totient is φ = 31409861368.

The previous prime is 31431000017. The next prime is 31431000047. The reversal of 31431000043 is 34000013413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34000013413 = 17 ⋅2000000789.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31431000043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31431000047) 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, 10567108 + ... + 10570081.

It is an arithmetic number, because the mean of its divisors is an integer number (7863034680).

Almost surely, 2^31431000043 is an apocalyptic number.

31431000043 is a deficient number, since it is larger than the sum of its proper divisors (21138677).

31431000043 is a wasteful number, since it uses less digits than its factorization.

31431000043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21138676.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 31431000043 its reverse (34000013413), we get a palindrome (65431013456).

The spelling of 31431000043 in words is "thirty-one billion, four hundred thirty-one million, forty-three", and thus it is an aban number.