73641521 has 2 divisors, whose sum is σ = 73641522. Its totient is φ = 73641520.

The previous prime is 73641517. The next prime is 73641541. The reversal of 73641521 is 12514637.

73641521 is nontrivially palindromic in base 2.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71639296 + 2002225 = 8464^2 + 1415^2 .

It is a cyclic number.

It is not a de Polignac number, because 73641521 - 2² = 73641517 is a prime.

It is not a weakly prime, because it can be changed into another prime (73641541) 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 as a sum of consecutive naturals, namely, 36820760 + 36820761.

It is an arithmetic number, because the mean of its divisors is an integer number (36820761).

Almost surely, 2^73641521 is an apocalyptic number.

It is an amenable number.

73641521 is a deficient number, since it is larger than the sum of its proper divisors (1).

73641521 is an equidigital number, since it uses as much as digits as its factorization.

73641521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 29.

The square root of 73641521 is about 8581.4638028719. The cubic root of 73641521 is about 419.1546128270.

The spelling of 73641521 in words is "seventy-three million, six hundred forty-one thousand, five hundred twenty-one".