812211689 has 4 divisors (see below), whose sum is σ = 821997456. Its totient is φ = 802425924.

The previous prime is 812211683. The next prime is 812211707. The reversal of 812211689 is 986112218.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-812211689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (812211683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4892759 + ... + 4892924.

It is an arithmetic number, because the mean of its divisors is an integer number (205499364).

Almost surely, 2^812211689 is an apocalyptic number.

It is an amenable number.

812211689 is a deficient number, since it is larger than the sum of its proper divisors (9785767).

812211689 is an equidigital number, since it uses as much as digits as its factorization.

812211689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9785766.

The product of its digits is 13824, while the sum is 38.

The square root of 812211689 is about 28499.3278692674. The cubic root of 812211689 is about 933.0174044520.

The spelling of 812211689 in words is "eight hundred twelve million, two hundred eleven thousand, six hundred eighty-nine".