199931496769 has 3 divisors (see below), whose sum is σ = 199931943907. Its totient is φ = 199931049632.

The previous prime is 199931496757. The next prime is 199931496823. The reversal of 199931496769 is 967694139991.

The square root of 199931496769 is 447137.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 188924969025 + 11006527744 = 434655^2 + 104912^2 .

It is not a de Polignac number, because 199931496769 - 2¹³ = 199931488577 is a prime.

It is a super-2 number, since 2×199931496769² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199931436769) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 223569 + ... + 670705.

Almost surely, 2^199931496769 is an apocalyptic number.

199931496769 is the 447137-th square number.

199931496769 is the 223569-th centered octagonal number.

It is an amenable number.

199931496769 is a deficient number, since it is larger than the sum of its proper divisors (447138).

199931496769 is an frugal number, since it uses more digits than its factorization.

199931496769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894274 (or 447137 counting only the distinct ones).

The product of its digits is 178564176, while the sum is 73.

The spelling of 199931496769 in words is "one hundred ninety-nine billion, nine hundred thirty-one million, four hundred ninety-six thousand, seven hundred sixty-nine".