31347780643 has 2 divisors, whose sum is σ = 31347780644. Its totient is φ = 31347780642.

The previous prime is 31347780631. The next prime is 31347780677. The reversal of 31347780643 is 34608774313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31347780643 - 2¹³ = 31347772451 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31347780593 and 31347780602.

It is not a weakly prime, because it can be changed into another prime (31347780613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15673890321 + 15673890322.

It is an arithmetic number, because the mean of its divisors is an integer number (15673890322).

Almost surely, 2^31347780643 is an apocalyptic number.

31347780643 is a deficient number, since it is larger than the sum of its proper divisors (1).

31347780643 is an equidigital number, since it uses as much as digits as its factorization.

31347780643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1016064, while the sum is 46.

The spelling of 31347780643 in words is "thirty-one billion, three hundred forty-seven million, seven hundred eighty thousand, six hundred forty-three".