8164191947 has 8 divisors (see below), whose sum is σ = 8793744960. Its totient is φ = 7554624840.

The previous prime is 8164191943. The next prime is 8164191989. The reversal of 8164191947 is 7491914618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8164191947 - 2² = 8164191943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8164191895 and 8164191904.

It is not an unprimeable number, because it can be changed into a prime (8164191943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4995629 + ... + 4997262.

It is an arithmetic number, because the mean of its divisors is an integer number (1099218120).

Almost surely, 2^8164191947 is an apocalyptic number.

8164191947 is a deficient number, since it is larger than the sum of its proper divisors (629553013).

8164191947 is a wasteful number, since it uses less digits than its factorization.

8164191947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9992953.

The product of its digits is 435456, while the sum is 50.

The square root of 8164191947 is about 90355.9181625642. The cubic root of 8164191947 is about 2013.5901075738.

The spelling of 8164191947 in words is "eight billion, one hundred sixty-four million, one hundred ninety-one thousand, nine hundred forty-seven".