1242001559 has 2 divisors, whose sum is σ = 1242001560. Its totient is φ = 1242001558.

The previous prime is 1242001543. The next prime is 1242001597. The reversal of 1242001559 is 9551002421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1242001559 - 2⁴ = 1242001543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242003559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621000779 + 621000780.

It is an arithmetic number, because the mean of its divisors is an integer number (621000780).

Almost surely, 2^1242001559 is an apocalyptic number.

1242001559 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242001559 is an equidigital number, since it uses as much as digits as its factorization.

1242001559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 1242001559 is about 35242.0424918874. The cubic root of 1242001559 is about 1074.9148110608.

The spelling of 1242001559 in words is "one billion, two hundred forty-two million, one thousand, five hundred fifty-nine".