2180155 has 16 divisors (see below), whose sum is σ = 2812320. Its totient is φ = 1617408.

The previous prime is 2180149. The next prime is 2180159. The reversal of 2180155 is 5510812.

It is a cyclic number.

It is not a de Polignac number, because 2180155 - 2⁷ = 2180027 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2180159) 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, 4819 + ... + 5251.

It is an arithmetic number, because the mean of its divisors is an integer number (175770).

2^2180155 is an apocalyptic number.

2180155 is a deficient number, since it is larger than the sum of its proper divisors (632165).

2180155 is a wasteful number, since it uses less digits than its factorization.

2180155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510.

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 2180155 is about 1476.5347947136. The cubic root of 2180155 is about 129.6668986969. Note that the first 3 decimals are identical.

Adding to 2180155 its reverse (5510812), we get a palindrome (7690967).

The spelling of 2180155 in words is "two million, one hundred eighty thousand, one hundred fifty-five".