1604081 has 2 divisors, whose sum is σ = 1604082. Its totient is φ = 1604080.

The previous prime is 1604059. The next prime is 1604087. The reversal of 1604081 is 1804061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1175056 + 429025 = 1084^2 + 655^2 .

It is a cyclic number.

It is not a de Polignac number, because 1604081 - 2⁶ = 1604017 is a prime.

It is a super-2 number, since 2×1604081² = 5146151709122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1604087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802040 + 802041.

It is an arithmetic number, because the mean of its divisors is an integer number (802041).

2^1604081 is an apocalyptic number.

It is an amenable number.

1604081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604081 is an equidigital number, since it uses as much as digits as its factorization.

1604081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 1604081 is about 1266.5231936289. The cubic root of 1604081 is about 117.0600660725.

Subtracting from 1604081 its sum of digits (20), we obtain a palindrome (1604061).

The spelling of 1604081 in words is "one million, six hundred four thousand, eighty-one".