2155559 has 6 divisors (see below), whose sum is σ = 2507544. Its totient is φ = 1847580.

The previous prime is 2155519. The next prime is 2155579. The reversal of 2155559 is 9555512.

It is not a de Polignac number, because 2155559 - 2¹² = 2151463 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 (2155519) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21947 + ... + 22044.

It is an arithmetic number, because the mean of its divisors is an integer number (417924).

2^2155559 is an apocalyptic number.

2155559 is a deficient number, since it is larger than the sum of its proper divisors (351985).

2155559 is an equidigital number, since it uses as much as digits as its factorization.

2155559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44005 (or 43998 counting only the distinct ones).

The product of its digits is 11250, while the sum is 32.

The square root of 2155559 is about 1468.1822094005. The cubic root of 2155559 is about 129.1774294651.

The spelling of 2155559 in words is "two million, one hundred fifty-five thousand, five hundred fifty-nine".