73544021 has 2 divisors, whose sum is σ = 73544022. Its totient is φ = 73544020.

The previous prime is 73544017. The next prime is 73544027. The reversal of 73544021 is 12044537.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66178225 + 7365796 = 8135^2 + 2714^2 .

It is a cyclic number.

It is not a de Polignac number, because 73544021 - 2² = 73544017 is a prime.

It is a super-3 number, since 3×73544021³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73544027) 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 as a sum of consecutive naturals, namely, 36772010 + 36772011.

It is an arithmetic number, because the mean of its divisors is an integer number (36772011).

Almost surely, 2^73544021 is an apocalyptic number.

It is an amenable number.

73544021 is a deficient number, since it is larger than the sum of its proper divisors (1).

73544021 is an equidigital number, since it uses as much as digits as its factorization.

73544021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 73544021 is about 8575.7810722989. The cubic root of 73544021 is about 418.9695468323.

Adding to 73544021 its reverse (12044537), we get a palindrome (85588558).

The spelling of 73544021 in words is "seventy-three million, five hundred forty-four thousand, twenty-one".