31841512643 has 2 divisors, whose sum is σ = 31841512644. Its totient is φ = 31841512642.

The previous prime is 31841512631. The next prime is 31841512679. The reversal of 31841512643 is 34621514813.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31841512643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31841512597 and 31841512606.

It is not a weakly prime, because it can be changed into another prime (31841512613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15920756321 + 15920756322.

It is an arithmetic number, because the mean of its divisors is an integer number (15920756322).

Almost surely, 2^31841512643 is an apocalyptic number.

31841512643 is a deficient number, since it is larger than the sum of its proper divisors (1).

31841512643 is an equidigital number, since it uses as much as digits as its factorization.

31841512643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 38.

The spelling of 31841512643 in words is "thirty-one billion, eight hundred forty-one million, five hundred twelve thousand, six hundred forty-three".