1605745903 has 2 divisors, whose sum is σ = 1605745904. Its totient is φ = 1605745902.

The previous prime is 1605745873. The next prime is 1605745927. The reversal of 1605745903 is 3095475061.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1605745903 - 2⁵ = 1605745871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1605745103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802872951 + 802872952.

It is an arithmetic number, because the mean of its divisors is an integer number (802872952).

Almost surely, 2^1605745903 is an apocalyptic number.

1605745903 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605745903 is an equidigital number, since it uses as much as digits as its factorization.

1605745903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 113400, while the sum is 40.

The square root of 1605745903 is about 40071.7594198208. The cubic root of 1605745903 is about 1171.0055161451.

The spelling of 1605745903 in words is "one billion, six hundred five million, seven hundred forty-five thousand, nine hundred three".