1605142859 has 2 divisors, whose sum is σ = 1605142860. Its totient is φ = 1605142858.

The previous prime is 1605142853. The next prime is 1605142867. The reversal of 1605142859 is 9582415061.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1605142859 - 2⁸ = 1605142603 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1605142853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802571429 + 802571430.

It is an arithmetic number, because the mean of its divisors is an integer number (802571430).

Almost surely, 2^1605142859 is an apocalyptic number.

1605142859 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605142859 is an equidigital number, since it uses as much as digits as its factorization.

1605142859 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86400, while the sum is 41.

The square root of 1605142859 is about 40064.2341621552. The cubic root of 1605142859 is about 1170.8589059272.

The spelling of 1605142859 in words is "one billion, six hundred five million, one hundred forty-two thousand, eight hundred fifty-nine".