1172281217 has 2 divisors, whose sum is σ = 1172281218. Its totient is φ = 1172281216.

The previous prime is 1172281109. The next prime is 1172281241. The reversal of 1172281217 is 7121822711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1169708401 + 2572816 = 34201^2 + 1604^2 .

It is an emirp because it is prime and its reverse (7121822711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1172281217 - 2²⁶ = 1105172353 is a prime.

It is not a weakly prime, because it can be changed into another prime (1172281267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 586140608 + 586140609.

It is an arithmetic number, because the mean of its divisors is an integer number (586140609).

Almost surely, 2^1172281217 is an apocalyptic number.

It is an amenable number.

1172281217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1172281217 is an equidigital number, since it uses as much as digits as its factorization.

1172281217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3136, while the sum is 32.

The square root of 1172281217 is about 34238.5925090387. The cubic root of 1172281217 is about 1054.4126368206.

The spelling of 1172281217 in words is "one billion, one hundred seventy-two million, two hundred eighty-one thousand, two hundred seventeen".