2156559 has 16 divisors (see below), whose sum is σ = 2993760. Its totient is φ = 1379840.

The previous prime is 2156537. The next prime is 2156597. The reversal of 2156559 is 9556512.

It is a cyclic number.

It is not a de Polignac number, because 2156559 - 2⁸ = 2156303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156599) 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, 10849 + ... + 11045.

It is an arithmetic number, because the mean of its divisors is an integer number (187110).

2^2156559 is an apocalyptic number.

2156559 is a deficient number, since it is larger than the sum of its proper divisors (837201).

2156559 is a wasteful number, since it uses less digits than its factorization.

2156559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330.

The product of its digits is 13500, while the sum is 33.

The square root of 2156559 is about 1468.5227270969. The cubic root of 2156559 is about 129.1974022360.

The spelling of 2156559 in words is "two million, one hundred fifty-six thousand, five hundred fifty-nine".