1661008 has 10 divisors (see below), whose sum is σ = 3218234. Its totient is φ = 830496.

The previous prime is 1661003. The next prime is 1661021. The reversal of 1661008 is 8001661.

It can be written as a sum of positive squares in only one way, i.e., 1065024 + 595984 = 1032^2 + 772^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1661008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51891 + ... + 51922.

2^1661008 is an apocalyptic number.

It is an amenable number.

1661008 is a deficient number, since it is larger than the sum of its proper divisors (1557226).

1661008 is a wasteful number, since it uses less digits than its factorization.

1661008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103821 (or 103815 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1661008 is about 1288.8009931716. The cubic root of 1661008 is about 118.4287761807.

Adding to 1661008 its reverse (8001661), we get a palindrome (9662669).

The spelling of 1661008 in words is "one million, six hundred sixty-one thousand, eight".