1604504641 has 2 divisors, whose sum is σ = 1604504642. Its totient is φ = 1604504640.

The previous prime is 1604504599. The next prime is 1604504651. The reversal of 1604504641 is 1464054061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 973440000 + 631064641 = 31200^2 + 25121^2 .

It is an emirp because it is prime and its reverse (1464054061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1604504641 - 2⁷ = 1604504513 is a prime.

It is not a weakly prime, because it can be changed into another prime (1604504651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802252320 + 802252321.

It is an arithmetic number, because the mean of its divisors is an integer number (802252321).

Almost surely, 2^1604504641 is an apocalyptic number.

It is an amenable number.

1604504641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604504641 is an equidigital number, since it uses as much as digits as its factorization.

1604504641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 1604504641 is about 40056.2684357892. The cubic root of 1604504641 is about 1170.7037043126.

The spelling of 1604504641 in words is "one billion, six hundred four million, five hundred four thousand, six hundred forty-one".