9919432137169 has 9 divisors (see below), whose sum is σ = 9952818392937. Its totient is φ = 9886157532324.

The previous prime is 9919432137163. The next prime is 9919432137187. The reversal of 9919432137169 is 9617312349199.

The square root of 9919432137169 is 3149513.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 9919432137169 - 2¹¹ = 9919432135121 is a prime.

It is a super-2 number, since 2×9919432137169² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9919432137169.

It is not an unprimeable number, because it can be changed into a prime (9919432137163) 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 in 8 ways as a sum of consecutive naturals, for example, 966895362 + ... + 966905620.

Almost surely, 2^{9919432137169} is an apocalyptic number.

9919432137169 is the 3149513-rd square number.

9919432137169 is the 1574757-th centered octagonal number.

It is an amenable number.

9919432137169 is a deficient number, since it is larger than the sum of its proper divisors (33386255768).

9919432137169 is an frugal number, since it uses more digits than its factorization.

9919432137169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21132 (or 10566 counting only the distinct ones).

The product of its digits is 19840464, while the sum is 64.

Multiplying 9919432137169 by its sum of digits (64), we get a square (634843656778816 = 25196104²).

The spelling of 9919432137169 in words is "nine trillion, nine hundred nineteen billion, four hundred thirty-two million, one hundred thirty-seven thousand, one hundred sixty-nine".