31930654643 has 2 divisors, whose sum is σ = 31930654644. Its totient is φ = 31930654642.

The previous prime is 31930654633. The next prime is 31930654661. The reversal of 31930654643 is 34645603913.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31930654643 - 2¹² = 31930650547 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 31930654594 and 31930654603.

It is not a weakly prime, because it can be changed into another prime (31930654633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15965327321 + 15965327322.

It is an arithmetic number, because the mean of its divisors is an integer number (15965327322).

Almost surely, 2^31930654643 is an apocalyptic number.

31930654643 is a deficient number, since it is larger than the sum of its proper divisors (1).

31930654643 is an equidigital number, since it uses as much as digits as its factorization.

31930654643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 44.

The spelling of 31930654643 in words is "thirty-one billion, nine hundred thirty million, six hundred fifty-four thousand, six hundred forty-three".