8193981 has 4 divisors (see below), whose sum is σ = 10925312. Its totient is φ = 5462652.

The previous prime is 8193961. The next prime is 8194007. The reversal of 8193981 is 1893918.

It is a happy number.

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 not a de Polignac number, because 8193981 - 2⁹ = 8193469 is a prime.

It is a super-2 number, since 2×8193981² = 134282649256722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8193961) 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, 1365661 + ... + 1365666.

It is an arithmetic number, because the mean of its divisors is an integer number (2731328).

Almost surely, 2^8193981 is an apocalyptic number.

It is an amenable number.

8193981 is a deficient number, since it is larger than the sum of its proper divisors (2731331).

8193981 is a wasteful number, since it uses less digits than its factorization.

8193981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2731330.

The product of its digits is 15552, while the sum is 39.

The square root of 8193981 is about 2862.5130567388. The cubic root of 8193981 is about 201.6036160459.

The spelling of 8193981 in words is "eight million, one hundred ninety-three thousand, nine hundred eighty-one".