8191173957 has 4 divisors (see below), whose sum is σ = 10921565280. Its totient is φ = 5460782636.

The previous prime is 8191173943. The next prime is 8191174049. The reversal of 8191173957 is 7593711918.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8191173957 - 2¹⁴ = 8191157573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8191163957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1365195657 + ... + 1365195662.

It is an arithmetic number, because the mean of its divisors is an integer number (2730391320).

Almost surely, 2^8191173957 is an apocalyptic number.

It is an amenable number.

8191173957 is a deficient number, since it is larger than the sum of its proper divisors (2730391323).

8191173957 is a wasteful number, since it uses less digits than its factorization.

8191173957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2730391322.

The product of its digits is 476280, while the sum is 51.

The square root of 8191173957 is about 90505.1045908461. The cubic root of 8191173957 is about 2015.8059204602.

The spelling of 8191173957 in words is "eight billion, one hundred ninety-one million, one hundred seventy-three thousand, nine hundred fifty-seven".