1687331 has 2 divisors, whose sum is σ = 1687332. Its totient is φ = 1687330.

The previous prime is 1687327. The next prime is 1687339. The reversal of 1687331 is 1337861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1687331 - 2² = 1687327 is a prime.

It is a super-2 number, since 2×1687331² = 5694171807122, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1687294 and 1687303.

It is not a weakly prime, because it can be changed into another prime (1687339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843665 + 843666.

It is an arithmetic number, because the mean of its divisors is an integer number (843666).

2^1687331 is an apocalyptic number.

1687331 is a deficient number, since it is larger than the sum of its proper divisors (1).

1687331 is an equidigital number, since it uses as much as digits as its factorization.

1687331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 29.

The square root of 1687331 is about 1298.9730559176. The cubic root of 1687331 is about 119.0511043830.

The spelling of 1687331 in words is "one million, six hundred eighty-seven thousand, three hundred thirty-one".