1559138542121 has 4 divisors (see below), whose sum is σ = 1559928781572. Its totient is φ = 1558348302672.

The previous prime is 1559138542081. The next prime is 1559138542153. The reversal of 1559138542121 is 1212458319551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 140981475625 + 1418157066496 = 375475^2 + 1190864^2 .

It is a cyclic number.

It is not a de Polignac number, because 1559138542121 - 2¹⁰ = 1559138541097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1559138542321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 395116766 + ... + 395120711.

It is an arithmetic number, because the mean of its divisors is an integer number (389982195393).

Almost surely, 2^{1559138542121} is an apocalyptic number.

It is an amenable number.

1559138542121 is a deficient number, since it is larger than the sum of its proper divisors (790239451).

1559138542121 is an equidigital number, since it uses as much as digits as its factorization.

1559138542121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790239450.

The product of its digits is 432000, while the sum is 47.

The spelling of 1559138542121 in words is "one trillion, five hundred fifty-nine billion, one hundred thirty-eight million, five hundred forty-two thousand, one hundred twenty-one".