8177994491 has 4 divisors (see below), whose sum is σ = 8293177584. Its totient is φ = 8062811400.

The previous prime is 8177994479. The next prime is 8177994541. The reversal of 8177994491 is 1944997718.

8177994491 is digitally balanced in base 3, 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: 1944997718 = 2 ⋅972498859.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8177994491 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8177994491.

It is not an unprimeable number, because it can be changed into a prime (8177994191) 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, 57591440 + ... + 57591581.

It is an arithmetic number, because the mean of its divisors is an integer number (2073294396).

Almost surely, 2^8177994491 is an apocalyptic number.

8177994491 is a deficient number, since it is larger than the sum of its proper divisors (115183093).

8177994491 is a wasteful number, since it uses less digits than its factorization.

8177994491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115183092.

The product of its digits is 4572288, while the sum is 59.

The square root of 8177994491 is about 90432.2646570349. The cubic root of 8177994491 is about 2014.7242070926.

The spelling of 8177994491 in words is "eight billion, one hundred seventy-seven million, nine hundred ninety-four thousand, four hundred ninety-one".