1661136 has 20 divisors (see below), whose sum is σ = 4291392. Its totient is φ = 553696.

The previous prime is 1661123. The next prime is 1661137. The reversal of 1661136 is 6311661.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661137) 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, 17256 + ... + 17351.

2^1661136 is an apocalyptic number.

1661136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1661136 is an abundant number, since it is smaller than the sum of its proper divisors (2630256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1661136 is a wasteful number, since it uses less digits than its factorization.

1661136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34618 (or 34612 counting only the distinct ones).

The product of its digits is 648, while the sum is 24.

The square root of 1661136 is about 1288.8506507738. The cubic root of 1661136 is about 118.4318182078.

Adding to 1661136 its reverse (6311661), we get a palindrome (7972797).

The spelling of 1661136 in words is "one million, six hundred sixty-one thousand, one hundred thirty-six".