8003661 has 4 divisors (see below), whose sum is σ = 10671552. Its totient is φ = 5335772.

The previous prime is 8003659. The next prime is 8003663. The reversal of 8003661 is 1663008.

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 an interprime number because it is at equal distance from previous prime (8003659) and next prime (8003663).

It is a cyclic number.

It is not a de Polignac number, because 8003661 - 2¹ = 8003659 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8003663) 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, 1333941 + ... + 1333946.

It is an arithmetic number, because the mean of its divisors is an integer number (2667888).

Almost surely, 2^8003661 is an apocalyptic number.

It is an amenable number.

8003661 is a deficient number, since it is larger than the sum of its proper divisors (2667891).

8003661 is a wasteful number, since it uses less digits than its factorization.

8003661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2667890.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 8003661 is about 2829.0742302032. The cubic root of 8003661 is about 200.0305036807.

Adding to 8003661 its reverse (1663008), we get a palindrome (9666669).

The spelling of 8003661 in words is "eight million, three thousand, six hundred sixty-one".