1604561069 has 4 divisors (see below), whose sum is σ = 1605001596. Its totient is φ = 1604120544.

The previous prime is 1604561051. The next prime is 1604561087. The reversal of 1604561069 is 9601654061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9601654061 = 5849 ⋅1641589.

It is an interprime number because it is at equal distance from previous prime (1604561051) and next prime (1604561087).

It can be written as a sum of positive squares in 2 ways, for example, as 172922500 + 1431638569 = 13150^2 + 37837^2 .

It is a cyclic number.

It is not a de Polignac number, because 1604561069 - 2¹⁶ = 1604495533 is a prime.

It is a super-2 number, since 2×1604561069² = 5149232448300845522, 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 (1604561669) 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, 214754 + ... + 222099.

It is an arithmetic number, because the mean of its divisors is an integer number (401250399).

Almost surely, 2^1604561069 is an apocalyptic number.

It is an amenable number.

1604561069 is a deficient number, since it is larger than the sum of its proper divisors (440527).

1604561069 is an equidigital number, since it uses as much as digits as its factorization.

1604561069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440526.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 1604561069 is about 40056.9727887668. The cubic root of 1604561069 is about 1170.7174281109.

The spelling of 1604561069 in words is "one billion, six hundred four million, five hundred sixty-one thousand, sixty-nine".