811342451809 has 4 divisors (see below), whose sum is σ = 859068478404. Its totient is φ = 763616425216.

The previous prime is 811342451807. The next prime is 811342451819. The reversal of 811342451809 is 908154243118.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 908154243118 = 2 ⋅454077121559.

It can be written as a sum of positive squares in 2 ways, for example, as 751168890000 + 60173561809 = 866700^2 + 245303^2 .

It is not a de Polignac number, because 811342451809 - 2¹ = 811342451807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (811342451807) 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, 23863013272 + ... + 23863013305.

It is an arithmetic number, because the mean of its divisors is an integer number (214767119601).

Almost surely, 2^811342451809 is an apocalyptic number.

It is an amenable number.

811342451809 is a deficient number, since it is larger than the sum of its proper divisors (47726026595).

811342451809 is a wasteful number, since it uses less digits than its factorization.

811342451809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47726026594.

The product of its (nonzero) digits is 276480, while the sum is 46.

The spelling of 811342451809 in words is "eight hundred eleven billion, three hundred forty-two million, four hundred fifty-one thousand, eight hundred nine".