812621443 has 4 divisors (see below), whose sum is σ = 825943168. Its totient is φ = 799299720.

The previous prime is 812621429. The next prime is 812621461. The reversal of 812621443 is 344126218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 344126218 = 2 ⋅172063109.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-812621443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (812621423) 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, 6660771 + ... + 6660892.

It is an arithmetic number, because the mean of its divisors is an integer number (206485792).

Almost surely, 2^812621443 is an apocalyptic number.

812621443 is a deficient number, since it is larger than the sum of its proper divisors (13321725).

812621443 is a wasteful number, since it uses less digits than its factorization.

812621443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13321724.

The product of its digits is 9216, while the sum is 31.

The square root of 812621443 is about 28506.5157990239. The cubic root of 812621443 is about 933.1742778987.

The spelling of 812621443 in words is "eight hundred twelve million, six hundred twenty-one thousand, four hundred forty-three".