291089 has 2 divisors, whose sum is σ = 291090. Its totient is φ = 291088.

The previous prime is 291077. The next prime is 291101. The reversal of 291089 is 980192.

It is a balanced prime because it is at equal distance from previous prime (291077) and next prime (291101).

It can be written as a sum of positive squares in only one way, i.e., 146689 + 144400 = 383^2 + 380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-291089 is a prime.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 291089.

It is not a weakly prime, because it can be changed into another prime (291689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145544 + 145545.

It is an arithmetic number, because the mean of its divisors is an integer number (145545).

2²⁹¹⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

291089 is a deficient number, since it is larger than the sum of its proper divisors (1).

291089 is an equidigital number, since it uses as much as digits as its factorization.

291089 is an odious number, because the sum of its binary digits is odd.

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

The square root of 291089 is about 539.5266443838. The cubic root of 291089 is about 66.2738089339.

The spelling of 291089 in words is "two hundred ninety-one thousand, eighty-nine".