8161791 has 16 divisors (see below), whose sum is σ = 11950848. Its totient is φ = 4913600.

The previous prime is 8161763. The next prime is 8161807. The reversal of 8161791 is 1971618.

8161791 is nontrivially palindromic in base 13.

It is a cyclic number.

It is not a de Polignac number, because 8161791 - 2¹¹ = 8159743 is a prime.

It is a super-2 number, since 2×8161791² = 133229664655362, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33).

8161791 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8161591) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4771 + ... + 6251.

It is an arithmetic number, because the mean of its divisors is an integer number (746928).

Almost surely, 2^8161791 is an apocalyptic number.

8161791 is a deficient number, since it is larger than the sum of its proper divisors (3789057).

8161791 is a wasteful number, since it uses less digits than its factorization.

8161791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662.

The product of its digits is 3024, while the sum is 33.

The square root of 8161791 is about 2856.8848419214. The cubic root of 8161791 is about 201.3392700933.

The spelling of 8161791 in words is "eight million, one hundred sixty-one thousand, seven hundred ninety-one".