1997112169 has 4 divisors (see below), whose sum is σ = 2150736196. Its totient is φ = 1843488144.

The previous prime is 1997112151. The next prime is 1997112191. The reversal of 1997112169 is 9612117991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 831572569 + 1165539600 = 28837^2 + 34140^2 .

It is a cyclic number.

It is not a de Polignac number, because 1997112169 - 2⁵ = 1997112137 is a prime.

It is a super-2 number, since 2×1997112169² = 7976914031135769122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1997112269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76811994 + ... + 76812019.

It is an arithmetic number, because the mean of its divisors is an integer number (537684049).

Almost surely, 2^1997112169 is an apocalyptic number.

It is an amenable number.

1997112169 is a deficient number, since it is larger than the sum of its proper divisors (153624027).

1997112169 is a wasteful number, since it uses less digits than its factorization.

1997112169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153624026.

The product of its digits is 61236, while the sum is 46.

The square root of 1997112169 is about 44689.0609545558. The cubic root of 1997112169 is about 1259.3143512830.

The spelling of 1997112169 in words is "one billion, nine hundred ninety-seven million, one hundred twelve thousand, one hundred sixty-nine".