2685145 has 4 divisors (see below), whose sum is σ = 3222180. Its totient is φ = 2148112.

The previous prime is 2685121. The next prime is 2685169. The reversal of 2685145 is 5415862.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5415862 = 2 ⋅2707931.

It is an interprime number because it is at equal distance from previous prime (2685121) and next prime (2685169).

It can be written as a sum of positive squares in 2 ways, for example, as 1115136 + 1570009 = 1056^2 + 1253^2 .

It is a cyclic number.

It is not a de Polignac number, because 2685145 - 2⁵ = 2685113 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

2685145 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268510 + ... + 268519.

It is an arithmetic number, because the mean of its divisors is an integer number (805545).

2^2685145 is an apocalyptic number.

It is an amenable number.

2685145 is a deficient number, since it is larger than the sum of its proper divisors (537035).

2685145 is an equidigital number, since it uses as much as digits as its factorization.

2685145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537034.

The product of its digits is 9600, while the sum is 31.

The square root of 2685145 is about 1638.6412053894. The cubic root of 2685145 is about 138.9918218883.

It can be divided in two parts, 26851 and 45, that added together give a square (26896 = 164²).

The spelling of 2685145 in words is "two million, six hundred eighty-five thousand, one hundred forty-five".