1604557 has 2 divisors, whose sum is σ = 1604558. Its totient is φ = 1604556.

The previous prime is 1604543. The next prime is 1604567. The reversal of 1604557 is 7554061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1572516 + 32041 = 1254^2 + 179^2 .

It is an emirp because it is prime and its reverse (7554061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1604557 - 2¹¹ = 1602509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1604567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802278 + 802279.

It is an arithmetic number, because the mean of its divisors is an integer number (802279).

2^1604557 is an apocalyptic number.

It is an amenable number.

1604557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604557 is an equidigital number, since it uses as much as digits as its factorization.

1604557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 1604557 is about 1266.7110957120. The cubic root of 1604557 is about 117.0716438504.

The spelling of 1604557 in words is "one million, six hundred four thousand, five hundred fifty-seven".