73045561 has 4 divisors (see below), whose sum is σ = 73925712. Its totient is φ = 72165412.

The previous prime is 73045547. The next prime is 73045571. The reversal of 73045561 is 16554037.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16554037 = 41 ⋅403757.

It is a cyclic number.

It is not a de Polignac number, because 73045561 - 2⁵ = 73045529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73045571) 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 3 ways as a sum of consecutive naturals, for example, 439951 + ... + 440116.

It is an arithmetic number, because the mean of its divisors is an integer number (18481428).

Almost surely, 2^73045561 is an apocalyptic number.

It is an amenable number.

73045561 is a deficient number, since it is larger than the sum of its proper divisors (880151).

73045561 is an equidigital number, since it uses as much as digits as its factorization.

73045561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880150.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 73045561 is about 8546.6695852829. The cubic root of 73045561 is about 418.0208489864.

Adding to 73045561 its reverse (16554037), we get a palindrome (89599598).

The spelling of 73045561 in words is "seventy-three million, forty-five thousand, five hundred sixty-one".