8109111877 has 4 divisors (see below), whose sum is σ = 8586118476. Its totient is φ = 7632105280.

The previous prime is 8109111839. The next prime is 8109111889. The reversal of 8109111877 is 7781119018.

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 3358318401 + 4750793476 = 57951^2 + 68926^2 .

It is a cyclic number.

It is not a de Polignac number, because 8109111877 - 2²³ = 8100723269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8109111377) 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, 238503274 + ... + 238503307.

It is an arithmetic number, because the mean of its divisors is an integer number (2146529619).

Almost surely, 2^8109111877 is an apocalyptic number.

It is an amenable number.

8109111877 is a deficient number, since it is larger than the sum of its proper divisors (477006599).

8109111877 is a wasteful number, since it uses less digits than its factorization.

8109111877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477006598.

The product of its (nonzero) digits is 28224, while the sum is 43.

The square root of 8109111877 is about 90050.6073105562. The cubic root of 8109111877 is about 2009.0516286248.

The spelling of 8109111877 in words is "eight billion, one hundred nine million, one hundred eleven thousand, eight hundred seventy-seven".