1661316 has 24 divisors (see below), whose sum is σ = 3904320. Its totient is φ = 549792.

The previous prime is 1661311. The next prime is 1661327. The reversal of 1661316 is 6131661.

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

It is not an unprimeable number, because it can be changed into a prime (1661311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1590 + ... + 2418.

It is an arithmetic number, because the mean of its divisors is an integer number (162680).

2^1661316 is an apocalyptic number.

It is an amenable number.

1661316 is an abundant number, since it is smaller than the sum of its proper divisors (2243004).

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

1661316 is a wasteful number, since it uses less digits than its factorization.

1661316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1003 (or 1001 counting only the distinct ones).

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

The square root of 1661316 is about 1288.9204785401. The cubic root of 1661316 is about 118.4360957940.

Adding to 1661316 its reverse (6131661), we get a palindrome (7792977).

The spelling of 1661316 in words is "one million, six hundred sixty-one thousand, three hundred sixteen".