1228205117 has 2 divisors, whose sum is σ = 1228205118. Its totient is φ = 1228205116.

The previous prime is 1228205113. The next prime is 1228205119. The reversal of 1228205117 is 7115028221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1181021956 + 47183161 = 34366^2 + 6869^2 .

It is a cyclic number.

It is not a de Polignac number, because 1228205117 - 2² = 1228205113 is a prime.

Together with 1228205119, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1228205117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1228205113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614102558 + 614102559.

It is an arithmetic number, because the mean of its divisors is an integer number (614102559).

Almost surely, 2^1228205117 is an apocalyptic number.

It is an amenable number.

1228205117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228205117 is an equidigital number, since it uses as much as digits as its factorization.

1228205117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 1228205117 is about 35045.7574750497. The cubic root of 1228205117 is about 1070.9198474913.

The spelling of 1228205117 in words is "one billion, two hundred twenty-eight million, two hundred five thousand, one hundred seventeen".