133242191 has 2 divisors, whose sum is σ = 133242192. Its totient is φ = 133242190.

The previous prime is 133242127. The next prime is 133242223. The reversal of 133242191 is 191242331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 133242191 - 2⁶ = 133242127 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 133242191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133242121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66621095 + 66621096.

It is an arithmetic number, because the mean of its divisors is an integer number (66621096).

Almost surely, 2^133242191 is an apocalyptic number.

133242191 is a deficient number, since it is larger than the sum of its proper divisors (1).

133242191 is an equidigital number, since it uses as much as digits as its factorization.

133242191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 26.

The square root of 133242191 is about 11543.0581303223. The cubic root of 133242191 is about 510.7565230124.

The spelling of 133242191 in words is "one hundred thirty-three million, two hundred forty-two thousand, one hundred ninety-one".