191996117 has 2 divisors, whose sum is σ = 191996118. Its totient is φ = 191996116.

The previous prime is 191996107. The next prime is 191996137. The reversal of 191996117 is 711699191.

191996117 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185204881 + 6791236 = 13609^2 + 2606^2 .

It is a cyclic number.

It is not a de Polignac number, because 191996117 - 2⁸ = 191995861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191996107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95998058 + 95998059.

It is an arithmetic number, because the mean of its divisors is an integer number (95998059).

Almost surely, 2^191996117 is an apocalyptic number.

It is an amenable number.

191996117 is a deficient number, since it is larger than the sum of its proper divisors (1).

191996117 is an equidigital number, since it uses as much as digits as its factorization.

191996117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30618, while the sum is 44.

The square root of 191996117 is about 13856.2663441491. The cubic root of 191996117 is about 576.8959390307.

The spelling of 191996117 in words is "one hundred ninety-one million, nine hundred ninety-six thousand, one hundred seventeen".