812318691903 has 4 divisors (see below), whose sum is σ = 1083091589208. Its totient is φ = 541545794600.

The previous prime is 812318691889. The next prime is 812318691913. The reversal of 812318691903 is 309196813218.

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 812318691903 - 2²⁵ = 812285137471 is a prime.

It is a super-2 number, since 2×812318691903² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812318691913) 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, 135386448648 + ... + 135386448653.

It is an arithmetic number, because the mean of its divisors is an integer number (270772897302).

Almost surely, 2^812318691903 is an apocalyptic number.

812318691903 is a deficient number, since it is larger than the sum of its proper divisors (270772897305).

812318691903 is a wasteful number, since it uses less digits than its factorization.

812318691903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270772897304.

The product of its (nonzero) digits is 559872, while the sum is 51.

The spelling of 812318691903 in words is "eight hundred twelve billion, three hundred eighteen million, six hundred ninety-one thousand, nine hundred three".