1604319049 has 4 divisors (see below), whose sum is σ = 1606746820. Its totient is φ = 1601891280.

The previous prime is 1604318983. The next prime is 1604319077. The reversal of 1604319049 is 9409134061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9409134061 = 277 ⋅33967993.

It can be written as a sum of positive squares in 2 ways, for example, as 1233063225 + 371255824 = 35115^2 + 19268^2 .

It is a cyclic number.

It is not a de Polignac number, because 1604319049 - 2²¹ = 1602221897 is a prime.

It is a super-3 number, since 3×1604319049³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1604318999 and 1604319017.

It is not an unprimeable number, because it can be changed into a prime (1604319089) 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, 1212894 + ... + 1214215.

It is an arithmetic number, because the mean of its divisors is an integer number (401686705).

Almost surely, 2^1604319049 is an apocalyptic number.

It is an amenable number.

1604319049 is a deficient number, since it is larger than the sum of its proper divisors (2427771).

1604319049 is an equidigital number, since it uses as much as digits as its factorization.

1604319049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2427770.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 1604319049 is about 40053.9517276386. The cubic root of 1604319049 is about 1170.6585643954.

The spelling of 1604319049 in words is "one billion, six hundred four million, three hundred nineteen thousand, forty-nine".