291128093 has 2 divisors, whose sum is σ = 291128094. Its totient is φ = 291128092.

The previous prime is 291128087. The next prime is 291128107. The reversal of 291128093 is 390821192.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 286726489 + 4401604 = 16933^2 + 2098^2 .

It is a cyclic number.

It is not a de Polignac number, because 291128093 - 2⁶ = 291128029 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291128053) 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, 145564046 + 145564047.

It is an arithmetic number, because the mean of its divisors is an integer number (145564047).

Almost surely, 2^291128093 is an apocalyptic number.

It is an amenable number.

291128093 is a deficient number, since it is larger than the sum of its proper divisors (1).

291128093 is an equidigital number, since it uses as much as digits as its factorization.

291128093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 291128093 is about 17062.4761684815. The cubic root of 291128093 is about 662.7677563944.

The spelling of 291128093 in words is "two hundred ninety-one million, one hundred twenty-eight thousand, ninety-three".