1604553 has 4 divisors (see below), whose sum is σ = 2139408. Its totient is φ = 1069700.

The previous prime is 1604543. The next prime is 1604557. The reversal of 1604553 is 3554061.

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 1604553 - 2⁵ = 1604521 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1604557) 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, 267423 + ... + 267428.

It is an arithmetic number, because the mean of its divisors is an integer number (534852).

2^1604553 is an apocalyptic number.

It is an amenable number.

1604553 is a deficient number, since it is larger than the sum of its proper divisors (534855).

1604553 is an equidigital number, since it uses as much as digits as its factorization.

1604553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534854.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 1604553 is about 1266.7095168191. The cubic root of 1604553 is about 117.0715465677.

The spelling of 1604553 in words is "one million, six hundred four thousand, five hundred fifty-three".