2178081 has 6 divisors (see below), whose sum is σ = 3146130. Its totient is φ = 1452048.

The previous prime is 2178073. The next prime is 2178083. The reversal of 2178081 is 1808712.

It can be written as a sum of positive squares in only one way, i.e., 2030625 + 147456 = 1425^2 + 384^2 .

It is not a de Polignac number, because 2178081 - 2³ = 2178073 is a prime.

It is a super-2 number, since 2×2178081² = 9488073685122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2178083) 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, 120996 + ... + 121013.

It is an arithmetic number, because the mean of its divisors is an integer number (524355).

2^2178081 is an apocalyptic number.

It is an amenable number.

2178081 is a deficient number, since it is larger than the sum of its proper divisors (968049).

2178081 is a wasteful number, since it uses less digits than its factorization.

2178081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242015 (or 242012 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 2178081 is about 1475.8323075472. The cubic root of 2178081 is about 129.6257679102.

The spelling of 2178081 in words is "two million, one hundred seventy-eight thousand, eighty-one".