75657217 has 2 divisors, whose sum is σ = 75657218. Its totient is φ = 75657216.

The previous prime is 75657199. The next prime is 75657223. The reversal of 75657217 is 71275657.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58384881 + 17272336 = 7641^2 + 4156^2 .

It is an emirp because it is prime and its reverse (71275657) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75657217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 75657217.

It is not a weakly prime, because it can be changed into another prime (75657247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37828608 + 37828609.

It is an arithmetic number, because the mean of its divisors is an integer number (37828609).

Almost surely, 2^75657217 is an apocalyptic number.

It is an amenable number.

75657217 is a deficient number, since it is larger than the sum of its proper divisors (1).

75657217 is an equidigital number, since it uses as much as digits as its factorization.

75657217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 102900, while the sum is 40.

The square root of 75657217 is about 8698.1157154869. The cubic root of 75657217 is about 422.9445703813.

The spelling of 75657217 in words is "seventy-five million, six hundred fifty-seven thousand, two hundred seventeen".