1605135743 has 2 divisors, whose sum is σ = 1605135744. Its totient is φ = 1605135742.

The previous prime is 1605135673. The next prime is 1605135811. The reversal of 1605135743 is 3475315061.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1605135743 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1605132743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802567871 + 802567872.

It is an arithmetic number, because the mean of its divisors is an integer number (802567872).

Almost surely, 2^1605135743 is an apocalyptic number.

1605135743 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605135743 is an equidigital number, since it uses as much as digits as its factorization.

1605135743 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 1605135743 is about 40064.1453546684. The cubic root of 1605135743 is about 1170.8571756878.

The spelling of 1605135743 in words is "one billion, six hundred five million, one hundred thirty-five thousand, seven hundred forty-three".