75444217 has 2 divisors, whose sum is σ = 75444218. Its totient is φ = 75444216.

The previous prime is 75444199. The next prime is 75444227. The reversal of 75444217 is 71244457.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45643536 + 29800681 = 6756^2 + 5459^2 .

It is an emirp because it is prime and its reverse (71244457) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75444217 - 2¹⁵ = 75411449 is a prime.

It is not a weakly prime, because it can be changed into another prime (75444227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37722108 + 37722109.

It is an arithmetic number, because the mean of its divisors is an integer number (37722109).

Almost surely, 2^75444217 is an apocalyptic number.

It is an amenable number.

75444217 is a deficient number, since it is larger than the sum of its proper divisors (1).

75444217 is an equidigital number, since it uses as much as digits as its factorization.

75444217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31360, while the sum is 34.

The square root of 75444217 is about 8685.8630544120. The cubic root of 75444217 is about 422.5472878692.

The spelling of 75444217 in words is "seventy-five million, four hundred forty-four thousand, two hundred seventeen".