1608521 has 4 divisors (see below), whose sum is σ = 1693200. Its totient is φ = 1523844.

The previous prime is 1608511. The next prime is 1608527. The reversal of 1608521 is 1258061.

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.

It is a cyclic number.

It is not a de Polignac number, because 1608521 - 2¹⁸ = 1346377 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1608527) 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, 42311 + ... + 42348.

It is an arithmetic number, because the mean of its divisors is an integer number (423300).

2^1608521 is an apocalyptic number.

It is an amenable number.

1608521 is a deficient number, since it is larger than the sum of its proper divisors (84679).

1608521 is an equidigital number, since it uses as much as digits as its factorization.

1608521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84678.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 1608521 is about 1268.2748124914. The cubic root of 1608521 is about 117.1679716556.

The spelling of 1608521 in words is "one million, six hundred eight thousand, five hundred twenty-one".