291246661 has 2 divisors, whose sum is σ = 291246662. Its totient is φ = 291246660.

The previous prime is 291246589. The next prime is 291246673. The reversal of 291246661 is 166642192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 249450436 + 41796225 = 15794^2 + 6465^2 .

It is a cyclic number.

It is not a de Polignac number, because 291246661 - 2⁹ = 291246149 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 291246661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291246161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145623330 + 145623331.

It is an arithmetic number, because the mean of its divisors is an integer number (145623331).

Almost surely, 2^291246661 is an apocalyptic number.

It is an amenable number.

291246661 is a deficient number, since it is larger than the sum of its proper divisors (1).

291246661 is an equidigital number, since it uses as much as digits as its factorization.

291246661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 37.

The square root of 291246661 is about 17065.9503397848. The cubic root of 291246661 is about 662.8577195223.

The spelling of 291246661 in words is "two hundred ninety-one million, two hundred forty-six thousand, six hundred sixty-one".