812645117 has 4 divisors (see below), whose sum is σ = 813472800. Its totient is φ = 811817436.

The previous prime is 812645107. The next prime is 812645153. The reversal of 812645117 is 711546218.

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 not a de Polignac number, because 812645117 - 2²⁴ = 795867901 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 (812645107) 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, 412367 + ... + 414332.

It is an arithmetic number, because the mean of its divisors is an integer number (203368200).

Almost surely, 2^812645117 is an apocalyptic number.

It is an amenable number.

812645117 is a deficient number, since it is larger than the sum of its proper divisors (827683).

812645117 is an equidigital number, since it uses as much as digits as its factorization.

812645117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827682.

The product of its digits is 13440, while the sum is 35.

The square root of 812645117 is about 28506.9310343993. The cubic root of 812645117 is about 933.1833398276.

The spelling of 812645117 in words is "eight hundred twelve million, six hundred forty-five thousand, one hundred seventeen".