8133661 has 4 divisors (see below), whose sum is σ = 8148672. Its totient is φ = 8118652.

The previous prime is 8133641. The next prime is 8133707. The reversal of 8133661 is 1663318.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1663318 = 2 ⋅831659.

It is a cyclic number.

It is not a de Polignac number, because 8133661 - 2⁷ = 8133533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8133611) 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, 6661 + ... + 7786.

It is an arithmetic number, because the mean of its divisors is an integer number (2037168).

Almost surely, 2^8133661 is an apocalyptic number.

It is an amenable number.

8133661 is a deficient number, since it is larger than the sum of its proper divisors (15011).

8133661 is a wasteful number, since it uses less digits than its factorization.

8133661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15010.

The product of its digits is 2592, while the sum is 28.

The square root of 8133661 is about 2851.9573979988. The cubic root of 8133661 is about 201.1076953951.

Adding to 8133661 its reverse (1663318), we get a palindrome (9796979).

The spelling of 8133661 in words is "eight million, one hundred thirty-three thousand, six hundred sixty-one".