19729731069 has 6 divisors (see below), whose sum is σ = 28498500446. Its totient is φ = 13153154040.

The previous prime is 19729731053. The next prime is 19729731083. The reversal of 19729731069 is 96013792791.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17467587225 + 2262143844 = 132165^2 + 47562^2 .

It is not a de Polignac number, because 19729731069 - 2⁴ = 19729731053 is a prime.

It is a super-2 number, since 2×19729731069² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19729731569) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1096096162 + ... + 1096096179.

Almost surely, 2^19729731069 is an apocalyptic number.

It is an amenable number.

19729731069 is a deficient number, since it is larger than the sum of its proper divisors (8768769377).

19729731069 is a wasteful number, since it uses less digits than its factorization.

19729731069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2192192347 (or 2192192344 counting only the distinct ones).

The product of its (nonzero) digits is 1285956, while the sum is 54.

The spelling of 19729731069 in words is "nineteen billion, seven hundred twenty-nine million, seven hundred thirty-one thousand, sixty-nine".