2801981 has 16 divisors (see below), whose sum is σ = 3537408. Its totient is φ = 2160000.

The previous prime is 2801977. The next prime is 2802011. The reversal of 2801981 is 1891082.

2801981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 2801981 - 2² = 2801977 is a prime.

It is a super-2 number, since 2×2801981² = 15702195048722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2801921) 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 15 ways as a sum of consecutive naturals, for example, 3356 + ... + 4106.

It is an arithmetic number, because the mean of its divisors is an integer number (221088).

2^2801981 is an apocalyptic number.

It is an amenable number.

2801981 is a deficient number, since it is larger than the sum of its proper divisors (735427).

2801981 is a wasteful number, since it uses less digits than its factorization.

2801981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 2801981 is about 1673.9118853751. The cubic root of 2801981 is about 140.9792065644.

The spelling of 2801981 in words is "two million, eight hundred one thousand, nine hundred eighty-one".