2154117 has 16 divisors (see below), whose sum is σ = 3333632. Its totient is φ = 1211760.

The previous prime is 2154109. The next prime is 2154127. The reversal of 2154117 is 7114512.

It is a happy number.

It is not a de Polignac number, because 2154117 - 2³ = 2154109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2154093 and 2154102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 642 + ... + 2172.

It is an arithmetic number, because the mean of its divisors is an integer number (208352).

2^2154117 is an apocalyptic number.

It is an amenable number.

2154117 is a deficient number, since it is larger than the sum of its proper divisors (1179515).

2154117 is a wasteful number, since it uses less digits than its factorization.

2154117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1608.

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

The square root of 2154117 is about 1467.6910437827. The cubic root of 2154117 is about 129.1486178504.

Adding to 2154117 its reverse (7114512), we get a palindrome (9268629).

The spelling of 2154117 in words is "two million, one hundred fifty-four thousand, one hundred seventeen".