117217691 has 2 divisors, whose sum is σ = 117217692. Its totient is φ = 117217690.

The previous prime is 117217687. The next prime is 117217693. The reversal of 117217691 is 196712711.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 117217691 - 2² = 117217687 is a prime.

Together with 117217693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (117217693) 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, 58608845 + 58608846.

It is an arithmetic number, because the mean of its divisors is an integer number (58608846).

Almost surely, 2^117217691 is an apocalyptic number.

117217691 is a deficient number, since it is larger than the sum of its proper divisors (1).

117217691 is an equidigital number, since it uses as much as digits as its factorization.

117217691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5292, while the sum is 35.

The square root of 117217691 is about 10826.7119200614. The cubic root of 117217691 is about 489.4004759889.

The spelling of 117217691 in words is "one hundred seventeen million, two hundred seventeen thousand, six hundred ninety-one".