31431312389 has 2 divisors, whose sum is σ = 31431312390. Its totient is φ = 31431312388.

The previous prime is 31431312301. The next prime is 31431312433. The reversal of 31431312389 is 98321313413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22607528164 + 8823784225 = 150358^2 + 93935^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31431312389 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31431372389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15715656194 + 15715656195.

It is an arithmetic number, because the mean of its divisors is an integer number (15715656195).

Almost surely, 2^31431312389 is an apocalyptic number.

It is an amenable number.

31431312389 is a deficient number, since it is larger than the sum of its proper divisors (1).

31431312389 is an equidigital number, since it uses as much as digits as its factorization.

31431312389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 38.

The spelling of 31431312389 in words is "thirty-one billion, four hundred thirty-one million, three hundred twelve thousand, three hundred eighty-nine".