109143621 has 12 divisors (see below), whose sum is σ = 166925772. Its totient is φ = 68482176.

The previous prime is 109143613. The next prime is 109143631. The reversal of 109143621 is 126341901.

It can be written as a sum of positive squares in 2 ways, for example, as 43046721 + 66096900 = 6561^2 + 8130^2 .

It is not a de Polignac number, because 109143621 - 2³ = 109143613 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109143611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 356526 + ... + 356831.

It is an arithmetic number, because the mean of its divisors is an integer number (13910481).

Almost surely, 2^109143621 is an apocalyptic number.

It is an amenable number.

109143621 is a deficient number, since it is larger than the sum of its proper divisors (57782151).

109143621 is a wasteful number, since it uses less digits than its factorization.

109143621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713380 (or 713377 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 109143621 is about 10447.1824431279. The cubic root of 109143621 is about 477.8953293452.

It can be divided in two parts, 10914 and 3621, that added together give a triangular number (14535 = T₁₇₀).

The spelling of 109143621 in words is "one hundred nine million, one hundred forty-three thousand, six hundred twenty-one".