31931709143 has 2 divisors, whose sum is σ = 31931709144. Its totient is φ = 31931709142.

The previous prime is 31931709119. The next prime is 31931709157. The reversal of 31931709143 is 34190713913.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31931709143 - 2¹⁴ = 31931692759 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31931709143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31931739143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15965854571 + 15965854572.

It is an arithmetic number, because the mean of its divisors is an integer number (15965854572).

Almost surely, 2^31931709143 is an apocalyptic number.

31931709143 is a deficient number, since it is larger than the sum of its proper divisors (1).

31931709143 is an equidigital number, since it uses as much as digits as its factorization.

31931709143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61236, while the sum is 41.

The spelling of 31931709143 in words is "thirty-one billion, nine hundred thirty-one million, seven hundred nine thousand, one hundred forty-three".