12311643 has 4 divisors (see below), whose sum is σ = 16415528. Its totient is φ = 8207760.

The previous prime is 12311641. The next prime is 12311653. The reversal of 12311643 is 34611321.

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

It is not a de Polignac number, because 12311643 - 2¹ = 12311641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12311641) 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, 2051938 + ... + 2051943.

It is an arithmetic number, because the mean of its divisors is an integer number (4103882).

Almost surely, 2^12311643 is an apocalyptic number.

12311643 is a deficient number, since it is larger than the sum of its proper divisors (4103885).

12311643 is an equidigital number, since it uses as much as digits as its factorization.

12311643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4103884.

The product of its digits is 432, while the sum is 21.

The square root of 12311643 is about 3508.7950923358. The cubic root of 12311643 is about 230.9078360245.

Adding to 12311643 its reverse (34611321), we get a palindrome (46922964).

It can be divided in two parts, 12 and 311643, that added together give a triangular number (311655 = T₇₈₉).

The spelling of 12311643 in words is "twelve million, three hundred eleven thousand, six hundred forty-three".