2165257 has 4 divisors (see below), whose sum is σ = 2235136. Its totient is φ = 2095380.

The previous prime is 2165249. The next prime is 2165291. The reversal of 2165257 is 7525612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2165257 - 2³ = 2165249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2165237) 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, 34893 + ... + 34954.

It is an arithmetic number, because the mean of its divisors is an integer number (558784).

2^2165257 is an apocalyptic number.

It is an amenable number.

2165257 is a deficient number, since it is larger than the sum of its proper divisors (69879).

2165257 is an equidigital number, since it uses as much as digits as its factorization.

2165257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69878.

The product of its digits is 4200, while the sum is 28.

The square root of 2165257 is about 1471.4812265197. The cubic root of 2165257 is about 129.3708655435.

The spelling of 2165257 in words is "two million, one hundred sixty-five thousand, two hundred fifty-seven".