1604661173 has 4 divisors (see below), whose sum is σ = 1631858880. Its totient is φ = 1577463468.

The previous prime is 1604661137. The next prime is 1604661187. The reversal of 1604661173 is 3711664061.

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 1604661173 - 2³⁰ = 530919349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604621173) 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, 13598765 + ... + 13598882.

It is an arithmetic number, because the mean of its divisors is an integer number (407964720).

Almost surely, 2^1604661173 is an apocalyptic number.

It is an amenable number.

1604661173 is a deficient number, since it is larger than the sum of its proper divisors (27197707).

1604661173 is an equidigital number, since it uses as much as digits as its factorization.

1604661173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27197706.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 1604661173 is about 40058.2222895625. Note that the first 4 decimals coincide. The cubic root of 1604661173 is about 1170.7417735144.

The spelling of 1604661173 in words is "one billion, six hundred four million, six hundred sixty-one thousand, one hundred seventy-three".