810985559 has 2 divisors, whose sum is σ = 810985560. Its totient is φ = 810985558.

The previous prime is 810985537. The next prime is 810985597. The reversal of 810985559 is 955589018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 810985559 - 2²⁸ = 542550103 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (810985529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405492779 + 405492780.

It is an arithmetic number, because the mean of its divisors is an integer number (405492780).

Almost surely, 2^810985559 is an apocalyptic number.

810985559 is a deficient number, since it is larger than the sum of its proper divisors (1).

810985559 is an equidigital number, since it uses as much as digits as its factorization.

810985559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648000, while the sum is 50.

The square root of 810985559 is about 28477.8081846198. The cubic root of 810985559 is about 932.5476678069.

The spelling of 810985559 in words is "eight hundred ten million, nine hundred eighty-five thousand, five hundred fifty-nine".