800631838121 has 4 divisors (see below), whose sum is σ = 800633668692. Its totient is φ = 800630007552.

The previous prime is 800631838079. The next prime is 800631838129. The reversal of 800631838121 is 121838136008.

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

It can be written as a sum of positive squares in 2 ways, for example, as 123197490025 + 677434348096 = 350995^2 + 823064^2 .

It is a cyclic number.

It is not a de Polignac number, because 800631838121 - 2³⁰ = 799558096297 is a prime.

It is a super-2 number, since 2×800631838121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (800631838129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168665 + ... + 1276601.

It is an arithmetic number, because the mean of its divisors is an integer number (200158417173).

Almost surely, 2^800631838121 is an apocalyptic number.

It is an amenable number.

800631838121 is a deficient number, since it is larger than the sum of its proper divisors (1830571).

800631838121 is a wasteful number, since it uses less digits than its factorization.

800631838121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1830570.

The product of its (nonzero) digits is 55296, while the sum is 41.

The spelling of 800631838121 in words is "eight hundred billion, six hundred thirty-one million, eight hundred thirty-eight thousand, one hundred twenty-one".