191812133 has 2 divisors, whose sum is σ = 191812134. Its totient is φ = 191812132.

The previous prime is 191812039. The next prime is 191812147. The reversal of 191812133 is 331218191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 174689089 + 17123044 = 13217^2 + 4138^2 .

It is a cyclic number.

It is not a de Polignac number, because 191812133 - 2¹⁸ = 191549989 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 191812096 and 191812105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191872133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95906066 + 95906067.

It is an arithmetic number, because the mean of its divisors is an integer number (95906067).

Almost surely, 2^191812133 is an apocalyptic number.

It is an amenable number.

191812133 is a deficient number, since it is larger than the sum of its proper divisors (1).

191812133 is an equidigital number, since it uses as much as digits as its factorization.

191812133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 29.

The square root of 191812133 is about 13849.6257350154. The cubic root of 191812133 is about 576.7116062334.

The spelling of 191812133 in words is "one hundred ninety-one million, eight hundred twelve thousand, one hundred thirty-three".