812820140131 has 4 divisors (see below), whose sum is σ = 812948412232. Its totient is φ = 812691868032.

The previous prime is 812820140117. The next prime is 812820140141. The reversal of 812820140131 is 131041028218.

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 812820140131 - 2¹³ = 812820131939 is a prime.

It is a super-2 number, since 2×812820140131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 812820140093 and 812820140102.

It is not an unprimeable number, because it can be changed into a prime (812820140141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64126545 + ... + 64139218.

It is an arithmetic number, because the mean of its divisors is an integer number (203237103058).

Almost surely, 2^812820140131 is an apocalyptic number.

812820140131 is a deficient number, since it is larger than the sum of its proper divisors (128272101).

812820140131 is a wasteful number, since it uses less digits than its factorization.

812820140131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128272100.

The product of its (nonzero) digits is 3072, while the sum is 31.

Adding to 812820140131 its reverse (131041028218), we get a palindrome (943861168349).

The spelling of 812820140131 in words is "eight hundred twelve billion, eight hundred twenty million, one hundred forty thousand, one hundred thirty-one".