291000133 has 2 divisors, whose sum is σ = 291000134. Its totient is φ = 291000132.

The previous prime is 291000041. The next prime is 291000187. The reversal of 291000133 is 331000192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 245329569 + 45670564 = 15663^2 + 6758^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-291000133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 291000133.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291000233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145500066 + 145500067.

It is an arithmetic number, because the mean of its divisors is an integer number (145500067).

Almost surely, 2^291000133 is an apocalyptic number.

It is an amenable number.

291000133 is a deficient number, since it is larger than the sum of its proper divisors (1).

291000133 is an equidigital number, since it uses as much as digits as its factorization.

291000133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 291000133 is about 17058.7260075306. The cubic root of 291000133 is about 662.6706397043.

The spelling of 291000133 in words is "two hundred ninety-one million, one hundred thirty-three", and thus it is an aban number.