19739072869 has 2 divisors, whose sum is σ = 19739072870. Its totient is φ = 19739072868.

The previous prime is 19739072839. The next prime is 19739072989. The reversal of 19739072869 is 96827093791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16829872900 + 2909199969 = 129730^2 + 53937^2 .

It is an emirp because it is prime and its reverse (96827093791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19739072869 - 2⁷ = 19739072741 is a prime.

It is a super-2 number, since 2×19739072869² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19739072819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9869536434 + 9869536435.

It is an arithmetic number, because the mean of its divisors is an integer number (9869536435).

Almost surely, 2^19739072869 is an apocalyptic number.

It is an amenable number.

19739072869 is a deficient number, since it is larger than the sum of its proper divisors (1).

19739072869 is an equidigital number, since it uses as much as digits as its factorization.

19739072869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10287648, while the sum is 61.

The spelling of 19739072869 in words is "nineteen billion, seven hundred thirty-nine million, seventy-two thousand, eight hundred sixty-nine".