2156065 has 4 divisors (see below), whose sum is σ = 2587284. Its totient is φ = 1724848.

The previous prime is 2156053. The next prime is 2156071. The reversal of 2156065 is 5606512.

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 620944 + 1535121 = 788^2 + 1239^2 .

It is a cyclic number.

It is not a de Polignac number, because 2156065 - 2²¹ = 58913 is a prime.

It is a Duffinian 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, 215602 + ... + 215611.

It is an arithmetic number, because the mean of its divisors is an integer number (646821).

2^2156065 is an apocalyptic number.

It is an amenable number.

2156065 is a deficient number, since it is larger than the sum of its proper divisors (431219).

2156065 is an equidigital number, since it uses as much as digits as its factorization.

2156065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431218.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 2156065 is about 1468.3545212244. The cubic root of 2156065 is about 129.1875364590.

The spelling of 2156065 in words is "two million, one hundred fifty-six thousand, sixty-five".