291475962843661 has 2 divisors, whose sum is σ = 291475962843662. Its totient is φ = 291475962843660.

The previous prime is 291475962843623. The next prime is 291475962843671. The reversal of 291475962843661 is 166348269574192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 289041005454436 + 2434957389225 = 17001206^2 + 1560435^2 .

It is a cyclic number.

It is not a de Polignac number, because 291475962843661 - 2¹⁷ = 291475962712589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291475962843671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145737981421830 + 145737981421831.

It is an arithmetic number, because the mean of its divisors is an integer number (145737981421831).

Almost surely, 2^{291475962843661} is an apocalyptic number.

It is an amenable number.

291475962843661 is a deficient number, since it is larger than the sum of its proper divisors (1).

291475962843661 is an equidigital number, since it uses as much as digits as its factorization.

291475962843661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 940584960, while the sum is 73.

The spelling of 291475962843661 in words is "two hundred ninety-one trillion, four hundred seventy-five billion, nine hundred sixty-two million, eight hundred forty-three thousand, six hundred sixty-one".