2161247 has 4 divisors (see below), whose sum is σ = 2357736. Its totient is φ = 1964760.

The previous prime is 2161213. The next prime is 2161253. The reversal of 2161247 is 7421612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2161247 - 2¹² = 2157151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161297) 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, 98228 + ... + 98249.

It is an arithmetic number, because the mean of its divisors is an integer number (589434).

2^2161247 is an apocalyptic number.

2161247 is a deficient number, since it is larger than the sum of its proper divisors (196489).

2161247 is a wasteful number, since it uses less digits than its factorization.

2161247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196488.

The product of its digits is 672, while the sum is 23.

The square root of 2161247 is about 1470.1180224730. The cubic root of 2161247 is about 129.2909523577.

Adding to 2161247 its reverse (7421612), we get a palindrome (9582859).

The spelling of 2161247 in words is "two million, one hundred sixty-one thousand, two hundred forty-seven".