19109468169 has 81 divisors (see below), whose sum is σ = 31303774957. Its totient is φ = 11224844400.

The previous prime is 19109468129. The next prime is 19109468179. The reversal of 19109468169 is 96186490191.

The square root of 19109468169 is 138237.

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

19109468169 is a `hidden beast` number, since 1 + 9 + 10 + 9 + 468 + 169 = 666.

It is not a de Polignac number, because 19109468169 - 2⁷ = 19109468041 is a prime.

It is a super-2 number, since 2×19109468169² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19109468129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 269147404 + ... + 269147474.

Almost surely, 2^19109468169 is an apocalyptic number.

19109468169 is the 138237-th square number.

19109468169 is the 69119-th centered octagonal number.

It is an amenable number.

19109468169 is a deficient number, since it is larger than the sum of its proper divisors (12194306788).

19109468169 is an equidigital number, since it uses as much as digits as its factorization.

19109468169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288 (or 144 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 54.

The spelling of 19109468169 in words is "nineteen billion, one hundred nine million, four hundred sixty-eight thousand, one hundred sixty-nine".