117218197 has 2 divisors, whose sum is σ = 117218198. Its totient is φ = 117218196.

The previous prime is 117218147. The next prime is 117218209. The reversal of 117218197 is 791812711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105698961 + 11519236 = 10281^2 + 3394^2 .

It is a cyclic number.

It is not a de Polignac number, because 117218197 - 2¹⁹ = 116693909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117218107) 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, 58609098 + 58609099.

It is an arithmetic number, because the mean of its divisors is an integer number (58609099).

Almost surely, 2^117218197 is an apocalyptic number.

It is an amenable number.

117218197 is a deficient number, since it is larger than the sum of its proper divisors (1).

117218197 is an equidigital number, since it uses as much as digits as its factorization.

117218197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 37.

The square root of 117218197 is about 10826.7352881651. The cubic root of 117218197 is about 489.4011801951.

The spelling of 117218197 in words is "one hundred seventeen million, two hundred eighteen thousand, one hundred ninety-seven".