1204521 has 4 divisors (see below), whose sum is σ = 1606032. Its totient is φ = 803012.

The previous prime is 1204519. The next prime is 1204529. The reversal of 1204521 is 1254021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1254021 = 3 ⋅418007.

It is a cyclic number.

It is not a de Polignac number, because 1204521 - 2¹ = 1204519 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 1204521.

It is not an unprimeable number, because it can be changed into a prime (1204529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200751 + ... + 200756.

It is an arithmetic number, because the mean of its divisors is an integer number (401508).

2^1204521 is an apocalyptic number.

It is an amenable number.

1204521 is a deficient number, since it is larger than the sum of its proper divisors (401511).

1204521 is an equidigital number, since it uses as much as digits as its factorization.

1204521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401510.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 1204521 is about 1097.5067197972. The cubic root of 1204521 is about 106.3991418798.

Adding to 1204521 its reverse (1254021), we get a palindrome (2458542).

The spelling of 1204521 in words is "one million, two hundred four thousand, five hundred twenty-one".