2821545 has 12 divisors (see below), whose sum is σ = 4890756. Its totient is φ = 1504800.

The previous prime is 2821543. The next prime is 2821549. The reversal of 2821545 is 5451282.

It is a happy number.

2821545 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 2 ways, for example, as 1172889 + 1648656 = 1083^2 + 1284^2 .

It is not a de Polignac number, because 2821545 - 2¹ = 2821543 is a prime.

It is a super-2 number, since 2×2821545² = 15922232374050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2821543) 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 11 ways as a sum of consecutive naturals, for example, 31306 + ... + 31395.

It is an arithmetic number, because the mean of its divisors is an integer number (407563).

2^2821545 is an apocalyptic number.

It is an amenable number.

2821545 is a deficient number, since it is larger than the sum of its proper divisors (2069211).

2821545 is a wasteful number, since it uses less digits than its factorization.

2821545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62712 (or 62709 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 2821545 is about 1679.7455164399. The cubic root of 2821545 is about 141.3065610013.

The spelling of 2821545 in words is "two million, eight hundred twenty-one thousand, five hundred forty-five".