1331816 has 16 divisors (see below), whose sum is σ = 2510340. Its totient is φ = 662400.

The previous prime is 1331801. The next prime is 1331821. The reversal of 1331816 is 6181331.

It can be written as a sum of positive squares in 2 ways, for example, as 1331716 + 100 = 1154^2 + 10^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1331791 and 1331800.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1916 + ... + 2516.

2^1331816 is an apocalyptic number.

It is an amenable number.

1331816 is a deficient number, since it is larger than the sum of its proper divisors (1178524).

1331816 is a wasteful number, since it uses less digits than its factorization.

1331816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884 (or 880 counting only the distinct ones).

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

The square root of 1331816 is about 1154.0433267430. The cubic root of 1331816 is about 110.0224747466.

The spelling of 1331816 in words is "one million, three hundred thirty-one thousand, eight hundred sixteen".