1687613 has 2 divisors, whose sum is σ = 1687614. Its totient is φ = 1687612.

The previous prime is 1687603. The next prime is 1687627. The reversal of 1687613 is 3167861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1684804 + 2809 = 1298^2 + 53^2 .

It is a cyclic number.

It is not a de Polignac number, because 1687613 - 2⁶ = 1687549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1687613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1687603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843806 + 843807.

It is an arithmetic number, because the mean of its divisors is an integer number (843807).

2^1687613 is an apocalyptic number.

It is an amenable number.

1687613 is a deficient number, since it is larger than the sum of its proper divisors (1).

1687613 is an equidigital number, since it uses as much as digits as its factorization.

1687613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 32.

The square root of 1687613 is about 1299.0815986688. The cubic root of 1687613 is about 119.0577362652.

The spelling of 1687613 in words is "one million, six hundred eighty-seven thousand, six hundred thirteen".