1685513 has 4 divisors (see below), whose sum is σ = 1688388. Its totient is φ = 1682640.

The previous prime is 1685503. The next prime is 1685521. The reversal of 1685513 is 3155861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3155861 = 277 ⋅11393.

It can be written as a sum of positive squares in 2 ways, for example, as 659344 + 1026169 = 812^2 + 1013^2 .

It is a cyclic number.

It is not a de Polignac number, because 1685513 - 2⁶ = 1685449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1685503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206 + ... + 1847.

It is an arithmetic number, because the mean of its divisors is an integer number (422097).

2^1685513 is an apocalyptic number.

It is an amenable number.

1685513 is a deficient number, since it is larger than the sum of its proper divisors (2875).

1685513 is an equidigital number, since it uses as much as digits as its factorization.

1685513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2874.

The product of its digits is 3600, while the sum is 29.

The square root of 1685513 is about 1298.2730837540. The cubic root of 1685513 is about 119.0083321614.

The spelling of 1685513 in words is "one million, six hundred eighty-five thousand, five hundred thirteen".