291728211871 has 2 divisors, whose sum is σ = 291728211872. Its totient is φ = 291728211870.

The previous prime is 291728211823. The next prime is 291728211979. The reversal of 291728211871 is 178112827192.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 291728211871 - 2²⁵ = 291694657439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291728211821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145864105935 + 145864105936.

It is an arithmetic number, because the mean of its divisors is an integer number (145864105936).

Almost surely, 2^291728211871 is an apocalyptic number.

291728211871 is a deficient number, since it is larger than the sum of its proper divisors (1).

291728211871 is an equidigital number, since it uses as much as digits as its factorization.

291728211871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 49.

The spelling of 291728211871 in words is "two hundred ninety-one billion, seven hundred twenty-eight million, two hundred eleven thousand, eight hundred seventy-one".