8169111493 has 4 divisors (see below), whose sum is σ = 8244057580. Its totient is φ = 8094165408.

The previous prime is 8169111481. The next prime is 8169111499. The reversal of 8169111493 is 3941119618.

It is a happy number.

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 6829039044 + 1340072449 = 82638^2 + 36607^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8169111493 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 (8169111499) 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, 37472880 + ... + 37473097.

It is an arithmetic number, because the mean of its divisors is an integer number (2061014395).

Almost surely, 2^8169111493 is an apocalyptic number.

It is an amenable number.

8169111493 is a deficient number, since it is larger than the sum of its proper divisors (74946087).

8169111493 is a wasteful number, since it uses less digits than its factorization.

8169111493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74946086.

The product of its digits is 46656, while the sum is 43.

The square root of 8169111493 is about 90383.1372159652. The cubic root of 8169111493 is about 2013.9944733781.

The spelling of 8169111493 in words is "eight billion, one hundred sixty-nine million, one hundred eleven thousand, four hundred ninety-three".