1218302117 has 2 divisors, whose sum is σ = 1218302118. Its totient is φ = 1218302116.

The previous prime is 1218302083. The next prime is 1218302119. The reversal of 1218302117 is 7112038121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 996917476 + 221384641 = 31574^2 + 14879^2 .

It is a cyclic number.

It is not a de Polignac number, because 1218302117 - 2⁶ = 1218302053 is a prime.

Together with 1218302119, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1218302119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609151058 + 609151059.

It is an arithmetic number, because the mean of its divisors is an integer number (609151059).

Almost surely, 2^1218302117 is an apocalyptic number.

It is an amenable number.

1218302117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218302117 is an equidigital number, since it uses as much as digits as its factorization.

1218302117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 1218302117 is about 34904.1848064097. The cubic root of 1218302117 is about 1068.0338064481.

The spelling of 1218302117 in words is "one billion, two hundred eighteen million, three hundred two thousand, one hundred seventeen".