2129555 has 4 divisors (see below), whose sum is σ = 2555472. Its totient is φ = 1703640.

The previous prime is 2129551. The next prime is 2129579. The reversal of 2129555 is 5559212.

2129555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 2129555 - 2² = 2129551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2129551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212951 + ... + 212960.

It is an arithmetic number, because the mean of its divisors is an integer number (638868).

2^2129555 is an apocalyptic number.

2129555 is a deficient number, since it is larger than the sum of its proper divisors (425917).

2129555 is an equidigital number, since it uses as much as digits as its factorization.

2129555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425916.

The product of its digits is 4500, while the sum is 29.

The square root of 2129555 is about 1459.2994894812. The cubic root of 2129555 is about 128.6558742711.

The spelling of 2129555 in words is "two million, one hundred twenty-nine thousand, five hundred fifty-five".