191900117 has 2 divisors, whose sum is σ = 191900118. Its totient is φ = 191900116.

The previous prime is 191900053. The next prime is 191900123. The reversal of 191900117 is 711009191.

191900117 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114618436 + 77281681 = 10706^2 + 8791^2 .

It is a cyclic number.

It is not a de Polignac number, because 191900117 - 2⁶ = 191900053 is a prime.

It is a super-2 number, since 2×191900117² = 73651309809227378, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 191900117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191900417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95950058 + 95950059.

It is an arithmetic number, because the mean of its divisors is an integer number (95950059).

Almost surely, 2^191900117 is an apocalyptic number.

It is an amenable number.

191900117 is a deficient number, since it is larger than the sum of its proper divisors (1).

191900117 is an equidigital number, since it uses as much as digits as its factorization.

191900117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 567, while the sum is 29.

The square root of 191900117 is about 13852.8017743704. The cubic root of 191900117 is about 576.7997717330.

The spelling of 191900117 in words is "one hundred ninety-one million, nine hundred thousand, one hundred seventeen".