73225561 has 2 divisors, whose sum is σ = 73225562. Its totient is φ = 73225560.

The previous prime is 73225531. The next prime is 73225597. The reversal of 73225561 is 16552237.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72999936 + 225625 = 8544^2 + 475^2 .

It is a cyclic number.

It is not a de Polignac number, because 73225561 - 2¹³ = 73217369 is a prime.

It is not a weakly prime, because it can be changed into another prime (73225501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36612780 + 36612781.

It is an arithmetic number, because the mean of its divisors is an integer number (36612781).

Almost surely, 2^73225561 is an apocalyptic number.

It is an amenable number.

73225561 is a deficient number, since it is larger than the sum of its proper divisors (1).

73225561 is an equidigital number, since it uses as much as digits as its factorization.

73225561 is an evil number, because the sum of its binary digits is even.

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

The square root of 73225561 is about 8557.1935235800. The cubic root of 73225561 is about 418.3639318088.

Adding to 73225561 its reverse (16552237), we get a palindrome (89777798).

The spelling of 73225561 in words is "seventy-three million, two hundred twenty-five thousand, five hundred sixty-one".