1912171792969 has 9 divisors (see below), whose sum is σ = 1941231695277. Its totient is φ = 1883540649804.

The previous prime is 1912171792879. The next prime is 1912171792981. The reversal of 1912171792969 is 9692971712191.

The square root of 1912171792969 is 1382813.

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

It is not a de Polignac number, because 1912171792969 - 2³¹ = 1910024309321 is a prime.

It is a super-2 number, since 2×1912171792969² (a number of 25 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 1912171792969.

It is not an unprimeable number, because it can be changed into a prime (1912571792969) 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, 92638152 + ... + 92658790.

Almost surely, 2^{1912171792969} is an apocalyptic number.

1912171792969 is the 1382813-rd square number.

1912171792969 is the 691407-th centered octagonal number.

It is an amenable number.

1912171792969 is a deficient number, since it is larger than the sum of its proper divisors (29059902308).

1912171792969 is an frugal number, since it uses more digits than its factorization.

1912171792969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41412 (or 20706 counting only the distinct ones).

The product of its digits is 7715736, while the sum is 64.

Multiplying 1912171792969 by its sum of digits (64), we get a square (122378994750016 = 11062504²).

The spelling of 1912171792969 in words is "one trillion, nine hundred twelve billion, one hundred seventy-one million, seven hundred ninety-two thousand, nine hundred sixty-nine".