31043743109 has 2 divisors, whose sum is σ = 31043743110. Its totient is φ = 31043743108.

The previous prime is 31043743051. The next prime is 31043743111. The reversal of 31043743109 is 90134734013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27127737025 + 3916006084 = 164705^2 + 62578^2 .

It is a cyclic number.

It is not a de Polignac number, because 31043743109 - 2²⁸ = 30775307653 is a prime.

Together with 31043743111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31043743169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15521871554 + 15521871555.

It is an arithmetic number, because the mean of its divisors is an integer number (15521871555).

Almost surely, 2^31043743109 is an apocalyptic number.

It is an amenable number.

31043743109 is a deficient number, since it is larger than the sum of its proper divisors (1).

31043743109 is an equidigital number, since it uses as much as digits as its factorization.

31043743109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 35.

The spelling of 31043743109 in words is "thirty-one billion, forty-three million, seven hundred forty-three thousand, one hundred nine".