2117145 has 32 divisors (see below), whose sum is σ = 3640320. Its totient is φ = 1048320.

The previous prime is 2117131. The next prime is 2117147. The reversal of 2117145 is 5417112.

It is a happy number.

It is not a de Polignac number, because 2117145 - 2⁹ = 2116633 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2117147) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13407 + ... + 13563.

It is an arithmetic number, because the mean of its divisors is an integer number (113760).

2^2117145 is an apocalyptic number.

It is an amenable number.

2117145 is a deficient number, since it is larger than the sum of its proper divisors (1523175).

2117145 is a wasteful number, since it uses less digits than its factorization.

2117145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225.

The product of its digits is 280, while the sum is 21.

The square root of 2117145 is about 1455.0412365291. The cubic root of 2117145 is about 128.4054728308.

The spelling of 2117145 in words is "two million, one hundred seventeen thousand, one hundred forty-five".