2945881 has 4 divisors (see below), whose sum is σ = 2955492. Its totient is φ = 2936272.

The previous prime is 2945869. The next prime is 2945933. The reversal of 2945881 is 1885492.

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 193600 + 2752281 = 440^2 + 1659^2 .

It is a cyclic number.

It is not a de Polignac number, because 2945881 - 2¹¹ = 2943833 is a prime.

It is a super-2 number, since 2×2945881² = 17356429732322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2945881.

It is not an unprimeable number, because it can be changed into a prime (2945851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4330 + ... + 4963.

It is an arithmetic number, because the mean of its divisors is an integer number (738873).

2^2945881 is an apocalyptic number.

It is an amenable number.

2945881 is a deficient number, since it is larger than the sum of its proper divisors (9611).

2945881 is an equidigital number, since it uses as much as digits as its factorization.

2945881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9610.

The product of its digits is 23040, while the sum is 37.

The square root of 2945881 is about 1716.3568976177. The cubic root of 2945881 is about 143.3524324048.

The spelling of 2945881 in words is "two million, nine hundred forty-five thousand, eight hundred eighty-one".