812113439 has 4 divisors (see below), whose sum is σ = 813672720. Its totient is φ = 810554160.

The previous prime is 812113411. The next prime is 812113441. The reversal of 812113439 is 934311218.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 812113439 - 2¹⁶ = 812047903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812113039) 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, 778859 + ... + 779900.

It is an arithmetic number, because the mean of its divisors is an integer number (203418180).

Almost surely, 2^812113439 is an apocalyptic number.

812113439 is a deficient number, since it is larger than the sum of its proper divisors (1559281).

812113439 is a wasteful number, since it uses less digits than its factorization.

812113439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1559280.

The product of its digits is 5184, while the sum is 32.

The square root of 812113439 is about 28497.6040922741. The cubic root of 812113439 is about 932.9797818069.

The spelling of 812113439 in words is "eight hundred twelve million, one hundred thirteen thousand, four hundred thirty-nine".