12161643 has 16 divisors (see below), whose sum is σ = 18066720. Its totient is φ = 7225344.

The previous prime is 12161629. The next prime is 12161651. The reversal of 12161643 is 34616121.

It is not a de Polignac number, because 12161643 - 2¹³ = 12153451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12161623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4246 + ... + 6507.

It is an arithmetic number, because the mean of its divisors is an integer number (1129170).

Almost surely, 2^12161643 is an apocalyptic number.

12161643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

12161643 is a deficient number, since it is larger than the sum of its proper divisors (5905077).

12161643 is a wasteful number, since it uses less digits than its factorization.

12161643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10798.

The product of its digits is 864, while the sum is 24.

The square root of 12161643 is about 3487.3547281571. The cubic root of 12161643 is about 229.9662395312.

Adding to 12161643 its reverse (34616121), we get a palindrome (46777764).

The spelling of 12161643 in words is "twelve million, one hundred sixty-one thousand, six hundred forty-three".