291201255689 has 2 divisors, whose sum is σ = 291201255690. Its totient is φ = 291201255688.

The previous prime is 291201255679. The next prime is 291201255721. The reversal of 291201255689 is 986552102192.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 277605695689 + 13595560000 = 526883^2 + 116600^2 .

It is a cyclic number.

It is not a de Polignac number, because 291201255689 - 2³² = 286906288393 is a prime.

It is not a weakly prime, because it can be changed into another prime (291201255679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145600627844 + 145600627845.

It is an arithmetic number, because the mean of its divisors is an integer number (145600627845).

Almost surely, 2^291201255689 is an apocalyptic number.

It is an amenable number.

291201255689 is a deficient number, since it is larger than the sum of its proper divisors (1).

291201255689 is an equidigital number, since it uses as much as digits as its factorization.

291201255689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 777600, while the sum is 50.

The spelling of 291201255689 in words is "two hundred ninety-one billion, two hundred one million, two hundred fifty-five thousand, six hundred eighty-nine".