12091644938 has 4 divisors (see below), whose sum is σ = 18137467410. Its totient is φ = 6045822468.

The previous prime is 12091644937. The next prime is 12091644967. The reversal of 12091644938 is 83944619021.

12091644938 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83944619021 = 91367 ⋅918763.

It can be written as a sum of positive squares in only one way, i.e., 6769504729 + 5322140209 = 82277^2 + 72953^2 .

It is a super-2 number, since 2×12091644938² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12091644892 and 12091644901.

It is not an unprimeable number, because it can be changed into a prime (12091644937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3022911233 + ... + 3022911236.

Almost surely, 2^12091644938 is an apocalyptic number.

12091644938 is a deficient number, since it is larger than the sum of its proper divisors (6045822472).

12091644938 is an equidigital number, since it uses as much as digits as its factorization.

12091644938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6045822471.

The product of its (nonzero) digits is 373248, while the sum is 47.

The spelling of 12091644938 in words is "twelve billion, ninety-one million, six hundred forty-four thousand, nine hundred thirty-eight".