1604252161 has 4 divisors (see below), whose sum is σ = 1626228292. Its totient is φ = 1582276032.

The previous prime is 1604252129. The next prime is 1604252197. The reversal of 1604252161 is 1612524061.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 431600625 + 1172651536 = 20775^2 + 34244^2 .

It is a cyclic number.

It is not a de Polignac number, because 1604252161 - 2⁵ = 1604252129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1604252101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10987956 + ... + 10988101.

It is an arithmetic number, because the mean of its divisors is an integer number (406557073).

Almost surely, 2^1604252161 is an apocalyptic number.

It is an amenable number.

1604252161 is a deficient number, since it is larger than the sum of its proper divisors (21976131).

1604252161 is an equidigital number, since it uses as much as digits as its factorization.

1604252161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21976130.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1604252161 is about 40053.1167451423. The cubic root of 1604252161 is about 1170.6422949594.

The spelling of 1604252161 in words is "one billion, six hundred four million, two hundred fifty-two thousand, one hundred sixty-one".