121117691 has 2 divisors, whose sum is σ = 121117692. Its totient is φ = 121117690.

The previous prime is 121117681. The next prime is 121117739. The reversal of 121117691 is 196711121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121117691 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121117621) 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, 60558845 + 60558846.

It is an arithmetic number, because the mean of its divisors is an integer number (60558846).

Almost surely, 2^121117691 is an apocalyptic number.

121117691 is a deficient number, since it is larger than the sum of its proper divisors (1).

121117691 is an equidigital number, since it uses as much as digits as its factorization.

121117691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 29.

The square root of 121117691 is about 11005.3482907176. The cubic root of 121117691 is about 494.7690532364.

The spelling of 121117691 in words is "one hundred twenty-one million, one hundred seventeen thousand, six hundred ninety-one".