2156717 has 4 divisors (see below), whose sum is σ = 2177760. Its totient is φ = 2135676.

The previous prime is 2156711. The next prime is 2156719. The reversal of 2156717 is 7176512.

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 a cyclic number.

It is not a de Polignac number, because 2156717 - 2⁸ = 2156461 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2156717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156711) 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, 10367 + ... + 10572.

It is an arithmetic number, because the mean of its divisors is an integer number (544440).

2^2156717 is an apocalyptic number.

It is an amenable number.

2156717 is a deficient number, since it is larger than the sum of its proper divisors (21043).

2156717 is a wasteful number, since it uses less digits than its factorization.

2156717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21042.

The product of its digits is 2940, while the sum is 29.

The square root of 2156717 is about 1468.5765216699. The cubic root of 2156717 is about 129.2005573690.

The spelling of 2156717 in words is "two million, one hundred fifty-six thousand, seven hundred seventeen".