291363027961 has 2 divisors, whose sum is σ = 291363027962. Its totient is φ = 291363027960.

The previous prime is 291363027853. The next prime is 291363027973. The reversal of 291363027961 is 169720363192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210377251561 + 80985776400 = 458669^2 + 284580^2 .

It is a cyclic number.

It is not a de Polignac number, because 291363027961 - 2¹³ = 291363019769 is a prime.

It is not a weakly prime, because it can be changed into another prime (291363057961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145681513980 + 145681513981.

It is an arithmetic number, because the mean of its divisors is an integer number (145681513981).

Almost surely, 2^291363027961 is an apocalyptic number.

It is an amenable number.

291363027961 is a deficient number, since it is larger than the sum of its proper divisors (1).

291363027961 is an equidigital number, since it uses as much as digits as its factorization.

291363027961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 734832, while the sum is 49.

The spelling of 291363027961 in words is "two hundred ninety-one billion, three hundred sixty-three million, twenty-seven thousand, nine hundred sixty-one".