133143191 has 2 divisors, whose sum is σ = 133143192. Its totient is φ = 133143190.

The previous prime is 133143187. The next prime is 133143217. The reversal of 133143191 is 191341331.

It is an a-pointer prime, because the next prime (133143217) can be obtained adding 133143191 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 133143191 - 2² = 133143187 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 133143191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133143121) 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, 66571595 + 66571596.

It is an arithmetic number, because the mean of its divisors is an integer number (66571596).

Almost surely, 2^133143191 is an apocalyptic number.

133143191 is a deficient number, since it is larger than the sum of its proper divisors (1).

133143191 is an equidigital number, since it uses as much as digits as its factorization.

133143191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 26.

The square root of 133143191 is about 11538.7690417999. The cubic root of 133143191 is about 510.6299929598.

The spelling of 133143191 in words is "one hundred thirty-three million, one hundred forty-three thousand, one hundred ninety-one".