12191198773 has 4 divisors (see below), whose sum is σ = 13128983308. Its totient is φ = 11253414240.

The previous prime is 12191198753. The next prime is 12191198777. The reversal of 12191198773 is 37789119121.

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 5960148804 + 6231049969 = 77202^2 + 78937^2 .

It is a cyclic number.

It is not a de Polignac number, because 12191198773 - 2¹³ = 12191190581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12191198777) 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, 468892248 + ... + 468892273.

It is an arithmetic number, because the mean of its divisors is an integer number (3282245827).

Almost surely, 2^12191198773 is an apocalyptic number.

12191198773 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

12191198773 is a deficient number, since it is larger than the sum of its proper divisors (937784535).

12191198773 is an equidigital number, since it uses as much as digits as its factorization.

12191198773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 937784534.

The product of its digits is 190512, while the sum is 49.

The spelling of 12191198773 in words is "twelve billion, one hundred ninety-one million, one hundred ninety-eight thousand, seven hundred seventy-three".