805049761 has 2 divisors, whose sum is σ = 805049762. Its totient is φ = 805049760.

The previous prime is 805049753. The next prime is 805049771. The reversal of 805049761 is 167940508.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 692689761 + 112360000 = 26319^2 + 10600^2 .

It is a cyclic number.

It is not a de Polignac number, because 805049761 - 2³ = 805049753 is a prime.

It is not a weakly prime, because it can be changed into another prime (805049711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402524880 + 402524881.

It is an arithmetic number, because the mean of its divisors is an integer number (402524881).

Almost surely, 2^805049761 is an apocalyptic number.

It is an amenable number.

805049761 is a deficient number, since it is larger than the sum of its proper divisors (1).

805049761 is an equidigital number, since it uses as much as digits as its factorization.

805049761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 805049761 is about 28373.3988270704. The cubic root of 805049761 is about 930.2669141760.

The spelling of 805049761 in words is "eight hundred five million, forty-nine thousand, seven hundred sixty-one".