4552821 has 64 divisors (see below), whose sum is σ = 8870400. Its totient is φ = 2239488.

The previous prime is 4552811. The next prime is 4552831. The reversal of 4552821 is 1282554.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (4552811) and next prime (4552831).

It is not a de Polignac number, because 4552821 - 2⁵ = 4552789 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4552811) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 41715 + ... + 41823.

It is an arithmetic number, because the mean of its divisors is an integer number (138600).

Almost surely, 2^4552821 is an apocalyptic number.

It is an amenable number.

4552821 is a deficient number, since it is larger than the sum of its proper divisors (4317579).

4552821 is a wasteful number, since it uses less digits than its factorization.

4552821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 149 counting only the distinct ones).

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

The square root of 4552821 is about 2133.7340509070. The cubic root of 4552821 is about 165.7398183791.

The spelling of 4552821 in words is "four million, five hundred fifty-two thousand, eight hundred twenty-one".