31431312431 has 4 divisors (see below), whose sum is σ = 31964046600. Its totient is φ = 30898578264.

The previous prime is 31431312389. The next prime is 31431312433. The reversal of 31431312431 is 13421313413.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31431312431 is a prime.

It is a super-2 number, since 2×31431312431² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31431312431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31431312433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266366996 + ... + 266367113.

It is an arithmetic number, because the mean of its divisors is an integer number (7991011650).

Almost surely, 2^31431312431 is an apocalyptic number.

31431312431 is a deficient number, since it is larger than the sum of its proper divisors (532734169).

31431312431 is an equidigital number, since it uses as much as digits as its factorization.

31431312431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532734168.

The product of its digits is 2592, while the sum is 26.

Adding to 31431312431 its reverse (13421313413), we get a palindrome (44852625844).

The spelling of 31431312431 in words is "thirty-one billion, four hundred thirty-one million, three hundred twelve thousand, four hundred thirty-one".