31531438843 has 2 divisors, whose sum is σ = 31531438844. Its totient is φ = 31531438842.

The previous prime is 31531438811. The next prime is 31531438849. The reversal of 31531438843 is 34883413513.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31531438843 - 2⁵ = 31531438811 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31531438843.

It is not a weakly prime, because it can be changed into another prime (31531438849) 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, 15765719421 + 15765719422.

It is an arithmetic number, because the mean of its divisors is an integer number (15765719422).

Almost surely, 2^31531438843 is an apocalyptic number.

31531438843 is a deficient number, since it is larger than the sum of its proper divisors (1).

31531438843 is an equidigital number, since it uses as much as digits as its factorization.

31531438843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 414720, while the sum is 43.

The spelling of 31531438843 in words is "thirty-one billion, five hundred thirty-one million, four hundred thirty-eight thousand, eight hundred forty-three".