1331885 has 16 divisors (see below), whose sum is σ = 1678320. Its totient is φ = 1013760.

The previous prime is 1331857. The next prime is 1331921. The reversal of 1331885 is 5881331.

It can be written as a sum of positive squares in 8 ways, for example, as 289444 + 1042441 = 538^2 + 1021^2 .

It is not a de Polignac number, because 1331885 - 2⁶ = 1331821 is a prime.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14921 + ... + 15009.

It is an arithmetic number, because the mean of its divisors is an integer number (104895).

2^1331885 is an apocalyptic number.

It is an amenable number.

1331885 is a deficient number, since it is larger than the sum of its proper divisors (346435).

1331885 is an equidigital number, since it uses as much as digits as its factorization.

1331885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208.

The product of its digits is 2880, while the sum is 29.

The square root of 1331885 is about 1154.0732212472. The cubic root of 1331885 is about 110.0243747637.

It can be divided in two parts, 13 and 31885, that multiplied together give a triangular number (414505 = T₉₁₀).

The spelling of 1331885 in words is "one million, three hundred thirty-one thousand, eight hundred eighty-five".