1331618 has 8 divisors (see below), whose sum is σ = 2020140. Its totient is φ = 658240.

The previous prime is 1331611. The next prime is 1331633. The reversal of 1331618 is 8161331.

It can be written as a sum of positive squares in 2 ways, for example, as 1329409 + 2209 = 1153^2 + 47^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1331593 and 1331602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331611) 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, 3563 + ... + 3918.

2^1331618 is an apocalyptic number.

1331618 is a deficient number, since it is larger than the sum of its proper divisors (688522).

1331618 is an equidigital number, since it uses as much as digits as its factorization.

1331618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7572.

The product of its digits is 432, while the sum is 23.

The square root of 1331618 is about 1153.9575382136. The cubic root of 1331618 is about 110.0170221591.

Adding to 1331618 its reverse (8161331), we get a palindrome (9492949).

The spelling of 1331618 in words is "one million, three hundred thirty-one thousand, six hundred eighteen".