2155085 has 4 divisors (see below), whose sum is σ = 2586108. Its totient is φ = 1724064.

The previous prime is 2155079. The next prime is 2155103. The reversal of 2155085 is 5805512.

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

It can be written as a sum of positive squares in 2 ways, for example, as 669124 + 1485961 = 818^2 + 1219^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155085 - 2⁸ = 2154829 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent 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, 215504 + ... + 215513.

It is an arithmetic number, because the mean of its divisors is an integer number (646527).

2^2155085 is an apocalyptic number.

It is an amenable number.

2155085 is a deficient number, since it is larger than the sum of its proper divisors (431023).

2155085 is an equidigital number, since it uses as much as digits as its factorization.

2155085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431022.

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 2155085 is about 1468.0207764197. The cubic root of 2155085 is about 129.1679602137.

The spelling of 2155085 in words is "two million, one hundred fifty-five thousand, eighty-five".