201191791 has 2 divisors, whose sum is σ = 201191792. Its totient is φ = 201191790.

The previous prime is 201191773. The next prime is 201191807. The reversal of 201191791 is 197191102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201191791 - 2⁷ = 201191663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201191191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100595895 + 100595896.

It is an arithmetic number, because the mean of its divisors is an integer number (100595896).

Almost surely, 2^201191791 is an apocalyptic number.

201191791 is a deficient number, since it is larger than the sum of its proper divisors (1).

201191791 is an equidigital number, since it uses as much as digits as its factorization.

201191791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 31.

The square root of 201191791 is about 14184.2092130651. The cubic root of 201191791 is about 585.9628539396.

The spelling of 201191791 in words is "two hundred one million, one hundred ninety-one thousand, seven hundred ninety-one".