4525421 has 6 divisors (see below), whose sum is σ = 4687722. Its totient is φ = 4368560.

The previous prime is 4525399. The next prime is 4525427. The reversal of 4525421 is 1245254.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 469225 + 4056196 = 685^2 + 2014^2 .

It is a de Polignac number, because none of the positive numbers 2^k-4525421 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4525427) 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 5 ways as a sum of consecutive naturals, for example, 1850 + ... + 3531.

It is an arithmetic number, because the mean of its divisors is an integer number (781287).

Almost surely, 2^4525421 is an apocalyptic number.

It is an amenable number.

4525421 is a deficient number, since it is larger than the sum of its proper divisors (162301).

4525421 is an equidigital number, since it uses as much as digits as its factorization.

4525421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5439 (or 5410 counting only the distinct ones).

The product of its digits is 1600, while the sum is 23.

The square root of 4525421 is about 2127.3036924708. The cubic root of 4525421 is about 165.4066614368.

The spelling of 4525421 in words is "four million, five hundred twenty-five thousand, four hundred twenty-one".