2160981 has 6 divisors (see below), whose sum is σ = 3121430. Its totient is φ = 1440648.

The previous prime is 2160971. The next prime is 2160997. The reversal of 2160981 is 1890612.

2160981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2160900 + 81 = 1470^2 + 9^2 .

It is not a de Polignac number, because 2160981 - 2⁹ = 2160469 is a prime.

It is a super-2 number, since 2×2160981² = 9339677764722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2160931) 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 5 ways as a sum of consecutive naturals, for example, 120046 + ... + 120063.

2^2160981 is an apocalyptic number.

It is an amenable number.

2160981 is a deficient number, since it is larger than the sum of its proper divisors (960449).

2160981 is a wasteful number, since it uses less digits than its factorization.

2160981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240115 (or 240112 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 2160981 is about 1470.0275507622. The cubic root of 2160981 is about 129.2856478885.

It can be divided in two parts, 21609 and 81, that multiplied together give a square (1750329 = 1323²).

The spelling of 2160981 in words is "two million, one hundred sixty thousand, nine hundred eighty-one".