820411291771 has 2 divisors, whose sum is σ = 820411291772. Its totient is φ = 820411291770.

The previous prime is 820411291741. The next prime is 820411291829. The reversal of 820411291771 is 177192114028.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820411291771 is a prime.

It is not a weakly prime, because it can be changed into another prime (820411291741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410205645885 + 410205645886.

It is an arithmetic number, because the mean of its divisors is an integer number (410205645886).

Almost surely, 2^820411291771 is an apocalyptic number.

820411291771 is a deficient number, since it is larger than the sum of its proper divisors (1).

820411291771 is an equidigital number, since it uses as much as digits as its factorization.

820411291771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 43.

The spelling of 820411291771 in words is "eight hundred twenty billion, four hundred eleven million, two hundred ninety-one thousand, seven hundred seventy-one".