73643121 has 16 divisors (see below), whose sum is σ = 109283200. Its totient is φ = 49013424.

The previous prime is 73643081. The next prime is 73643123. The reversal of 73643121 is 12134637.

73643121 is a `hidden beast` number, since 7 + 3 + 643 + 12 + 1 = 666.

It is not a de Polignac number, because 73643121 - 2¹⁰ = 73642097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73643123) 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, 17220 + ... + 21066.

It is an arithmetic number, because the mean of its divisors is an integer number (6830200).

Almost surely, 2^73643121 is an apocalyptic number.

It is an amenable number.

73643121 is a deficient number, since it is larger than the sum of its proper divisors (35640079).

73643121 is a wasteful number, since it uses less digits than its factorization.

73643121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4565 (or 4559 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 73643121 is about 8581.5570265541. The cubic root of 73643121 is about 419.1576484447.

Adding to 73643121 its reverse (12134637), we get a palindrome (85777758).

The spelling of 73643121 in words is "seventy-three million, six hundred forty-three thousand, one hundred twenty-one".