19870929139 has 2 divisors, whose sum is σ = 19870929140. Its totient is φ = 19870929138.

The previous prime is 19870929109. The next prime is 19870929149. The reversal of 19870929139 is 93192907891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19870929139 - 2¹¹ = 19870927091 is a prime.

It is not a weakly prime, because it can be changed into another prime (19870929109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9935464569 + 9935464570.

It is an arithmetic number, because the mean of its divisors is an integer number (9935464570).

Almost surely, 2^19870929139 is an apocalyptic number.

19870929139 is a deficient number, since it is larger than the sum of its proper divisors (1).

19870929139 is an equidigital number, since it uses as much as digits as its factorization.

19870929139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2204496, while the sum is 58.

The spelling of 19870929139 in words is "nineteen billion, eight hundred seventy million, nine hundred twenty-nine thousand, one hundred thirty-nine".