117091691 has 2 divisors, whose sum is σ = 117091692. Its totient is φ = 117091690.

The previous prime is 117091687. The next prime is 117091697. The reversal of 117091691 is 196190711.

It is a weak prime.

It is an emirp because it is prime and its reverse (196190711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 117091691 - 2² = 117091687 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (117091697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58545845 + 58545846.

It is an arithmetic number, because the mean of its divisors is an integer number (58545846).

Almost surely, 2^117091691 is an apocalyptic number.

117091691 is a deficient number, since it is larger than the sum of its proper divisors (1).

117091691 is an equidigital number, since it uses as much as digits as its factorization.

117091691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 35.

The square root of 117091691 is about 10820.8914142967. The cubic root of 117091691 is about 489.2250571663.

The spelling of 117091691 in words is "one hundred seventeen million, ninety-one thousand, six hundred ninety-one".