810698989 has 2 divisors, whose sum is σ = 810698990. Its totient is φ = 810698988.

The previous prime is 810698957. The next prime is 810699037. The reversal of 810698989 is 989896018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 780084900 + 30614089 = 27930^2 + 5533^2 .

It is a cyclic number.

It is not a de Polignac number, because 810698989 - 2⁵ = 810698957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (810698389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405349494 + 405349495.

It is an arithmetic number, because the mean of its divisors is an integer number (405349495).

Almost surely, 2^810698989 is an apocalyptic number.

It is an amenable number.

810698989 is a deficient number, since it is larger than the sum of its proper divisors (1).

810698989 is an equidigital number, since it uses as much as digits as its factorization.

810698989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2239488, while the sum is 58.

The square root of 810698989 is about 28472.7762784032. The cubic root of 810698989 is about 932.4378131304.

The spelling of 810698989 in words is "eight hundred ten million, six hundred ninety-eight thousand, nine hundred eighty-nine".