2821523 has 4 divisors (see below), whose sum is σ = 2860248. Its totient is φ = 2782800.

The previous prime is 2821517. The next prime is 2821537. The reversal of 2821523 is 3251282.

2821523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 2821523 - 2⁶ = 2821459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2821513) 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, 19253 + ... + 19398.

It is an arithmetic number, because the mean of its divisors is an integer number (715062).

2^2821523 is an apocalyptic number.

2821523 is a deficient number, since it is larger than the sum of its proper divisors (38725).

2821523 is an equidigital number, since it uses as much as digits as its factorization.

2821523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38724.

The product of its digits is 960, while the sum is 23.

The square root of 2821523 is about 1679.7389678161. The cubic root of 2821523 is about 141.3061937377.

Subtracting from 2821523 its sum of digits (23), we obtain a triangular number (2821500 = T₂₃₇₅).

The spelling of 2821523 in words is "two million, eight hundred twenty-one thousand, five hundred twenty-three".