811138087 has 4 divisors (see below), whose sum is σ = 833060776. Its totient is φ = 789215400.

The previous prime is 811138061. The next prime is 811138099. The reversal of 811138087 is 780831118.

811138087 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 780831118 = 2 ⋅390415559.

It is a cyclic number.

It is not a de Polignac number, because 811138087 - 2²⁷ = 676920359 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 21922651 = 811138087 / (8 + 1 + 1 + 1 + 3 + 8 + 0 + 8 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811138387) 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, 10961289 + ... + 10961362.

It is an arithmetic number, because the mean of its divisors is an integer number (208265194).

Almost surely, 2^811138087 is an apocalyptic number.

811138087 is a deficient number, since it is larger than the sum of its proper divisors (21922689).

811138087 is a wasteful number, since it uses less digits than its factorization.

811138087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21922688.

The product of its (nonzero) digits is 10752, while the sum is 37.

The square root of 811138087 is about 28480.4860738015. The cubic root of 811138087 is about 932.6061278344.

The spelling of 811138087 in words is "eight hundred eleven million, one hundred thirty-eight thousand, eighty-seven".