810853649 has 2 divisors, whose sum is σ = 810853650. Its totient is φ = 810853648.

The previous prime is 810853613. The next prime is 810853657. The reversal of 810853649 is 946358018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 668481025 + 142372624 = 25855^2 + 11932^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-810853649 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (810853609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405426824 + 405426825.

It is an arithmetic number, because the mean of its divisors is an integer number (405426825).

Almost surely, 2^810853649 is an apocalyptic number.

It is an amenable number.

810853649 is a deficient number, since it is larger than the sum of its proper divisors (1).

810853649 is an equidigital number, since it uses as much as digits as its factorization.

810853649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 810853649 is about 28475.4920765208. The cubic root of 810853649 is about 932.4971042132.

The spelling of 810853649 in words is "eight hundred ten million, eight hundred fifty-three thousand, six hundred forty-nine".