8191481 has 4 divisors (see below), whose sum is σ = 8202852. Its totient is φ = 8180112.

The previous prime is 8191441. The next prime is 8191493. The reversal of 8191481 is 1841918.

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 379456 + 7812025 = 616^2 + 2795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8191481 is a prime.

It is a super-2 number, since 2×8191481² = 134200721946722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (8191441) 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, 4526 + ... + 6071.

It is an arithmetic number, because the mean of its divisors is an integer number (2050713).

Almost surely, 2^8191481 is an apocalyptic number.

It is an amenable number.

8191481 is a deficient number, since it is larger than the sum of its proper divisors (11371).

8191481 is a wasteful number, since it uses less digits than its factorization.

8191481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11370.

The product of its digits is 2304, while the sum is 32.

The square root of 8191481 is about 2862.0763441949. The cubic root of 8191481 is about 201.5831107382.

The spelling of 8191481 in words is "eight million, one hundred ninety-one thousand, four hundred eighty-one".