73752221 has 2 divisors, whose sum is σ = 73752222. Its totient is φ = 73752220.

The previous prime is 73752199. The next prime is 73752229. The reversal of 73752221 is 12225737.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70728100 + 3024121 = 8410^2 + 1739^2 .

It is a cyclic number.

It is not a de Polignac number, because 73752221 - 2⁶ = 73752157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73752229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36876110 + 36876111.

It is an arithmetic number, because the mean of its divisors is an integer number (36876111).

Almost surely, 2^73752221 is an apocalyptic number.

It is an amenable number.

73752221 is a deficient number, since it is larger than the sum of its proper divisors (1).

73752221 is an equidigital number, since it uses as much as digits as its factorization.

73752221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5880, while the sum is 29.

The square root of 73752221 is about 8587.9113293047. The cubic root of 73752221 is about 419.3645359984.

Adding to 73752221 its reverse (12225737), we get a palindrome (85977958).

The spelling of 73752221 in words is "seventy-three million, seven hundred fifty-two thousand, two hundred twenty-one".