291642436539791 has 2 divisors, whose sum is σ = 291642436539792. Its totient is φ = 291642436539790.

The previous prime is 291642436539757. The next prime is 291642436539877. The reversal of 291642436539791 is 197935634246192.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-291642436539791 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291642439539791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145821218269895 + 145821218269896.

It is an arithmetic number, because the mean of its divisors is an integer number (145821218269896).

Almost surely, 2^{291642436539791} is an apocalyptic number.

291642436539791 is a deficient number, since it is larger than the sum of its proper divisors (1).

291642436539791 is an equidigital number, since it uses as much as digits as its factorization.

291642436539791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 529079040, while the sum is 71.

The spelling of 291642436539791 in words is "two hundred ninety-one trillion, six hundred forty-two billion, four hundred thirty-six million, five hundred thirty-nine thousand, seven hundred ninety-one".