2160406081 has 4 divisors (see below), whose sum is σ = 2161516500. Its totient is φ = 2159295664.

The previous prime is 2160406067. The next prime is 2160406091. The reversal of 2160406081 is 1806040612.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1124596225 + 1035809856 = 33535^2 + 32184^2 .

It is a cyclic number.

It is not a de Polignac number, because 2160406081 - 2²³ = 2152017473 is a prime.

It is a super-2 number, since 2×2160406081² = 9334708869643557122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2160406091) 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, 552286 + ... + 556183.

It is an arithmetic number, because the mean of its divisors is an integer number (540379125).

Almost surely, 2^2160406081 is an apocalyptic number.

It is an amenable number.

2160406081 is a deficient number, since it is larger than the sum of its proper divisors (1110419).

2160406081 is a wasteful number, since it uses less digits than its factorization.

2160406081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110418.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 2160406081 is about 46480.1686851500. The cubic root of 2160406081 is about 1292.7418158870.

Adding to 2160406081 its reverse (1806040612), we get a palindrome (3966446693).

The spelling of 2160406081 in words is "two billion, one hundred sixty million, four hundred six thousand, eighty-one".