1604149 has 2 divisors, whose sum is σ = 1604150. Its totient is φ = 1604148.

The previous prime is 1604147. The next prime is 1604167. The reversal of 1604149 is 9414061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1397124 + 207025 = 1182^2 + 455^2 .

It is a cyclic number.

It is not a de Polignac number, because 1604149 - 2¹ = 1604147 is a prime.

Together with 1604147, it forms a pair of twin primes.

1604149 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1604143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802074 + 802075.

It is an arithmetic number, because the mean of its divisors is an integer number (802075).

2^1604149 is an apocalyptic number.

It is an amenable number.

1604149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604149 is an equidigital number, since it uses as much as digits as its factorization.

1604149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1604149 is about 1266.5500384904. The cubic root of 1604149 is about 117.0617201810.

The spelling of 1604149 in words is "one million, six hundred four thousand, one hundred forty-nine".