2129117 has 4 divisors (see below), whose sum is σ = 2144796. Its totient is φ = 2113440.

The previous prime is 2129107. The next prime is 2129119. The reversal of 2129117 is 7119212.

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 1466521 + 662596 = 1211^2 + 814^2 .

It is a cyclic number.

It is not a de Polignac number, because 2129117 - 2¹⁸ = 1866973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2129092 and 2129101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2129119) 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, 7634 + ... + 7907.

It is an arithmetic number, because the mean of its divisors is an integer number (536199).

2^2129117 is an apocalyptic number.

It is an amenable number.

2129117 is a deficient number, since it is larger than the sum of its proper divisors (15679).

2129117 is a wasteful number, since it uses less digits than its factorization.

2129117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15678.

The product of its digits is 252, while the sum is 23.

The square root of 2129117 is about 1459.1494097590. The cubic root of 2129117 is about 128.6470531580.

The spelling of 2129117 in words is "two million, one hundred twenty-nine thousand, one hundred seventeen".