811688089 has 4 divisors (see below), whose sum is σ = 814683520. Its totient is φ = 808692660.

The previous prime is 811688083. The next prime is 811688179. The reversal of 811688089 is 980886118.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 980886118 = 2 ⋅490443059.

It is a cyclic number.

It is not a de Polignac number, because 811688089 - 2²⁹ = 274817177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (811688083) 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 in 3 ways as a sum of consecutive naturals, for example, 1497309 + ... + 1497850.

It is an arithmetic number, because the mean of its divisors is an integer number (203670880).

Almost surely, 2^811688089 is an apocalyptic number.

It is an amenable number.

811688089 is a deficient number, since it is larger than the sum of its proper divisors (2995431).

811688089 is a wasteful number, since it uses less digits than its factorization.

811688089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2995430.

The product of its (nonzero) digits is 221184, while the sum is 49.

The square root of 811688089 is about 28490.1402067452. The cubic root of 811688089 is about 932.8168685018.

It can be divided in two parts, 811 and 688089, that added together give a square (688900 = 830²).

The spelling of 811688089 in words is "eight hundred eleven million, six hundred eighty-eight thousand, eighty-nine".