805162861 has 2 divisors, whose sum is σ = 805162862. Its totient is φ = 805162860.

The previous prime is 805162849. The next prime is 805162877. The reversal of 805162861 is 168261508.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 488144836 + 317018025 = 22094^2 + 17805^2 .

It is a cyclic number.

It is not a de Polignac number, because 805162861 - 2⁷ = 805162733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 805162861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (805162801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402581430 + 402581431.

It is an arithmetic number, because the mean of its divisors is an integer number (402581431).

Almost surely, 2^805162861 is an apocalyptic number.

It is an amenable number.

805162861 is a deficient number, since it is larger than the sum of its proper divisors (1).

805162861 is an equidigital number, since it uses as much as digits as its factorization.

805162861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 805162861 is about 28375.3918210833. The cubic root of 805162861 is about 930.3104759807.

The spelling of 805162861 in words is "eight hundred five million, one hundred sixty-two thousand, eight hundred sixty-one".