2155555 has 8 divisors (see below), whose sum is σ = 2594592. Its totient is φ = 1719168.

The previous prime is 2155519. The next prime is 2155579. The reversal of 2155555 is 5555512.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2155555 - 2¹¹ = 2153507 is a prime.

It is an Ulam number.

It is a Duffinian number.

2155555 is a modest number, since divided by 5555 gives 215 as remainder.

2155555 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2602 + ... + 3328.

It is an arithmetic number, because the mean of its divisors is an integer number (324324).

2^2155555 is an apocalyptic number.

2155555 is a deficient number, since it is larger than the sum of its proper divisors (439037).

2155555 is an equidigital number, since it uses as much as digits as its factorization.

2155555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1325.

The product of its digits is 6250, while the sum is 28.

The square root of 2155555 is about 1468.1808471711. The cubic root of 2155555 is about 129.1773495616.

The spelling of 2155555 in words is "two million, one hundred fifty-five thousand, five hundred fifty-five".