1604651 has 2 divisors, whose sum is σ = 1604652. Its totient is φ = 1604650.

The previous prime is 1604621. The next prime is 1604711. The reversal of 1604651 is 1564061.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1604651 is a prime.

It is not a weakly prime, because it can be changed into another prime (1604611) 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, 802325 + 802326.

It is an arithmetic number, because the mean of its divisors is an integer number (802326).

2^1604651 is an apocalyptic number.

1604651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604651 is an equidigital number, since it uses as much as digits as its factorization.

1604651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1604651 is about 1266.7481991304. The cubic root of 1604651 is about 117.0739299476.

The spelling of 1604651 in words is "one million, six hundred four thousand, six hundred fifty-one".