4123521 has 8 divisors (see below), whose sum is σ = 6108960. Its totient is φ = 2748996.

The previous prime is 4123507. The next prime is 4123529. The reversal of 4123521 is 1253214.

It is not a de Polignac number, because 4123521 - 2⁵ = 4123489 is a prime.

4123521 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 4123494 and 4123503.

It is not an unprimeable number, because it can be changed into a prime (4123529) 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 7 ways as a sum of consecutive naturals, for example, 76335 + ... + 76388.

It is an arithmetic number, because the mean of its divisors is an integer number (763620).

Almost surely, 2^4123521 is an apocalyptic number.

It is an amenable number.

4123521 is a deficient number, since it is larger than the sum of its proper divisors (1985439).

4123521 is a wasteful number, since it uses less digits than its factorization.

4123521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152732 (or 152726 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 4123521 is about 2030.6454638858. The cubic root of 4123521 is about 160.3575467610.

Adding to 4123521 its reverse (1253214), we get a palindrome (5376735).

The spelling of 4123521 in words is "four million, one hundred twenty-three thousand, five hundred twenty-one".