117891197 has 2 divisors, whose sum is σ = 117891198. Its totient is φ = 117891196.

The previous prime is 117891173. The next prime is 117891199. The reversal of 117891197 is 791198711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91891396 + 25999801 = 9586^2 + 5099^2 .

It is a cyclic number.

It is not a de Polignac number, because 117891197 - 2¹⁰ = 117890173 is a prime.

Together with 117891199, 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 (117891199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58945598 + 58945599.

It is an arithmetic number, because the mean of its divisors is an integer number (58945599).

Almost surely, 2^117891197 is an apocalyptic number.

It is an amenable number.

117891197 is a deficient number, since it is larger than the sum of its proper divisors (1).

117891197 is an equidigital number, since it uses as much as digits as its factorization.

117891197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752, while the sum is 44.

The square root of 117891197 is about 10857.7712722271. The cubic root of 117891197 is about 490.3360141482.

The spelling of 117891197 in words is "one hundred seventeen million, eight hundred ninety-one thousand, one hundred ninety-seven".