191191841 has 2 divisors, whose sum is σ = 191191842. Its totient is φ = 191191840.

The previous prime is 191191831. The next prime is 191191879. The reversal of 191191841 is 148191191.

191191841 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., 152004241 + 39187600 = 12329^2 + 6260^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191191841 is a prime.

It is not a weakly prime, because it can be changed into another prime (191191831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95595920 + 95595921.

It is an arithmetic number, because the mean of its divisors is an integer number (95595921).

Almost surely, 2^191191841 is an apocalyptic number.

It is an amenable number.

191191841 is a deficient number, since it is larger than the sum of its proper divisors (1).

191191841 is an equidigital number, since it uses as much as digits as its factorization.

191191841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 35.

The square root of 191191841 is about 13827.2137829716. The cubic root of 191191841 is about 576.0892682906.

The spelling of 191191841 in words is "one hundred ninety-one million, one hundred ninety-one thousand, eight hundred forty-one".