191310841 has 2 divisors, whose sum is σ = 191310842. Its totient is φ = 191310840.

The previous prime is 191310811. The next prime is 191310853. The reversal of 191310841 is 148013191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124545600 + 66765241 = 11160^2 + 8171^2 .

It is an emirp because it is prime and its reverse (148013191) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191310841 is a prime.

It is not a weakly prime, because it can be changed into another prime (191310811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95655420 + 95655421.

It is an arithmetic number, because the mean of its divisors is an integer number (95655421).

Almost surely, 2^191310841 is an apocalyptic number.

It is an amenable number.

191310841 is a deficient number, since it is larger than the sum of its proper divisors (1).

191310841 is an equidigital number, since it uses as much as digits as its factorization.

191310841 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 191310841 is about 13831.5162220199. The cubic root of 191310841 is about 576.2087650300.

The spelling of 191310841 in words is "one hundred ninety-one million, three hundred ten thousand, eight hundred forty-one".