1331887 has 4 divisors (see below), whose sum is σ = 1345176. Its totient is φ = 1318600.

The previous prime is 1331857. The next prime is 1331921. The reversal of 1331887 is 7881331.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6493 + ... + 6694.

It is an arithmetic number, because the mean of its divisors is an integer number (336294).

2^1331887 is an apocalyptic number.

1331887 is a deficient number, since it is larger than the sum of its proper divisors (13289).

1331887 is a wasteful number, since it uses less digits than its factorization.

1331887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13288.

The product of its digits is 4032, while the sum is 31.

The square root of 1331887 is about 1154.0740877431. The cubic root of 1331887 is about 110.0244298357.

The spelling of 1331887 in words is "one million, three hundred thirty-one thousand, eight hundred eighty-seven".