19311781039 has 2 divisors, whose sum is σ = 19311781040. Its totient is φ = 19311781038.

The previous prime is 19311781037. The next prime is 19311781061. The reversal of 19311781039 is 93018711391.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19311781039 - 2¹ = 19311781037 is a prime.

Together with 19311781037, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 19311780986 and 19311781004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19311781033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9655890519 + 9655890520.

It is an arithmetic number, because the mean of its divisors is an integer number (9655890520).

Almost surely, 2^19311781039 is an apocalyptic number.

19311781039 is a deficient number, since it is larger than the sum of its proper divisors (1).

19311781039 is an equidigital number, since it uses as much as digits as its factorization.

19311781039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 43.

The spelling of 19311781039 in words is "nineteen billion, three hundred eleven million, seven hundred eighty-one thousand, thirty-nine".