191348317 has 2 divisors, whose sum is σ = 191348318. Its totient is φ = 191348316.

The previous prime is 191348299. The next prime is 191348321. The reversal of 191348317 is 713843191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184660921 + 6687396 = 13589^2 + 2586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191348317 is a prime.

It is a super-2 number, since 2×191348317² = 73228356837464978, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191348347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95674158 + 95674159.

It is an arithmetic number, because the mean of its divisors is an integer number (95674159).

Almost surely, 2^191348317 is an apocalyptic number.

It is an amenable number.

191348317 is a deficient number, since it is larger than the sum of its proper divisors (1).

191348317 is an equidigital number, since it uses as much as digits as its factorization.

191348317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 191348317 is about 13832.8708878526. The cubic root of 191348317 is about 576.2463872050.

The spelling of 191348317 in words is "one hundred ninety-one million, three hundred forty-eight thousand, three hundred seventeen".