2161517 has 4 divisors (see below), whose sum is σ = 2255520. Its totient is φ = 2067516.

The previous prime is 2161513. The next prime is 2161553. The reversal of 2161517 is 7151612.

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 not a de Polignac number, because 2161517 - 2² = 2161513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 93979 = 2161517 / (2 + 1 + 6 + 1 + 5 + 1 + 7).

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2161492 and 2161501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46967 + ... + 47012.

It is an arithmetic number, because the mean of its divisors is an integer number (563880).

2^2161517 is an apocalyptic number.

It is an amenable number.

2161517 is a deficient number, since it is larger than the sum of its proper divisors (94003).

2161517 is an equidigital number, since it uses as much as digits as its factorization.

2161517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94002.

The product of its digits is 420, while the sum is 23.

The square root of 2161517 is about 1470.2098489671. The cubic root of 2161517 is about 129.2963361482.

The spelling of 2161517 in words is "two million, one hundred sixty-one thousand, five hundred seventeen".