1604144381 has 4 divisors (see below), whose sum is σ = 1833307872. Its totient is φ = 1374980892.

The previous prime is 1604144341. The next prime is 1604144401. The reversal of 1604144381 is 1834414061.

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: 1834414061 = 2297 ⋅798613.

It is a cyclic number.

It is not a de Polignac number, because 1604144381 - 2²⁶ = 1537035517 is a prime.

It is a super-2 number, since 2×1604144381² = 5146558390187746322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604144341) 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, 114581735 + ... + 114581748.

It is an arithmetic number, because the mean of its divisors is an integer number (458326968).

Almost surely, 2^1604144381 is an apocalyptic number.

It is an amenable number.

1604144381 is a deficient number, since it is larger than the sum of its proper divisors (229163491).

1604144381 is an equidigital number, since it uses as much as digits as its factorization.

1604144381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229163490.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 1604144381 is about 40051.7712592090. The cubic root of 1604144381 is about 1170.6160782471.

The spelling of 1604144381 in words is "one billion, six hundred four million, one hundred forty-four thousand, three hundred eighty-one".