8193661 has 4 divisors (see below), whose sum is σ = 9364192. Its totient is φ = 7023132.

The previous prime is 8193649. The next prime is 8193667. The reversal of 8193661 is 1663918.

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 8193661 - 2⁵ = 8193629 is a prime.

It is a Duffinian number.

8193661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8193667) 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, 585255 + ... + 585268.

It is an arithmetic number, because the mean of its divisors is an integer number (2341048).

Almost surely, 2^8193661 is an apocalyptic number.

It is an amenable number.

8193661 is a deficient number, since it is larger than the sum of its proper divisors (1170531).

8193661 is a wasteful number, since it uses less digits than its factorization.

8193661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170530.

The product of its digits is 7776, while the sum is 34.

The square root of 8193661 is about 2862.4571612515. The cubic root of 8193661 is about 201.6009915993.

The spelling of 8193661 in words is "eight million, one hundred ninety-three thousand, six hundred sixty-one".