1641443121 has 6 divisors (see below), whose sum is σ = 2370973410. Its totient is φ = 1094295408.

The previous prime is 1641443059. The next prime is 1641443147. The reversal of 1641443121 is 1213441461.

1641443121 is a `hidden beast` number, since 1 + 641 + 4 + 4 + 3 + 12 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1226750625 + 414692496 = 35025^2 + 20364^2 .

It is not a de Polignac number, because 1641443121 - 2¹⁰ = 1641442097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1641443161) 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 in 5 ways as a sum of consecutive naturals, for example, 91191276 + ... + 91191293.

It is an arithmetic number, because the mean of its divisors is an integer number (395162235).

Almost surely, 2^1641443121 is an apocalyptic number.

It is an amenable number.

1641443121 is a deficient number, since it is larger than the sum of its proper divisors (729530289).

1641443121 is a wasteful number, since it uses less digits than its factorization.

1641443121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182382575 (or 182382572 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 1641443121 is about 40514.7272112253. The cubic root of 1641443121 is about 1179.6195079370.

Adding to 1641443121 its reverse (1213441461), we get a palindrome (2854884582).

The spelling of 1641443121 in words is "one billion, six hundred forty-one million, four hundred forty-three thousand, one hundred twenty-one".