811371688409 has 8 divisors (see below), whose sum is σ = 859408847208. Its totient is φ = 763368908800.

The previous prime is 811371688381. The next prime is 811371688417. The reversal of 811371688409 is 904886173118.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 356594094025 + 454777594384 = 597155^2 + 674372^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 811371688409 - 2²⁴ = 811354911193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (811371688109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8546192 + ... + 8640609.

It is an arithmetic number, because the mean of its divisors is an integer number (107426105901).

Almost surely, 2^811371688409 is an apocalyptic number.

It is an amenable number.

811371688409 is a deficient number, since it is larger than the sum of its proper divisors (48037158799).

811371688409 is a wasteful number, since it uses less digits than its factorization.

811371688409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17189595.

The product of its (nonzero) digits is 2322432, while the sum is 56.

The spelling of 811371688409 in words is "eight hundred eleven billion, three hundred seventy-one million, six hundred eighty-eight thousand, four hundred nine".