31431394847 has 2 divisors, whose sum is σ = 31431394848. Its totient is φ = 31431394846.

The previous prime is 31431394837. The next prime is 31431394861. The reversal of 31431394847 is 74849313413.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31431394847 - 2²⁰ = 31430346271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31431394837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15715697423 + 15715697424.

It is an arithmetic number, because the mean of its divisors is an integer number (15715697424).

Almost surely, 2^31431394847 is an apocalyptic number.

31431394847 is a deficient number, since it is larger than the sum of its proper divisors (1).

31431394847 is an equidigital number, since it uses as much as digits as its factorization.

31431394847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 47.

The spelling of 31431394847 in words is "thirty-one billion, four hundred thirty-one million, three hundred ninety-four thousand, eight hundred forty-seven".