1239806121359 has 4 divisors (see below), whose sum is σ = 1335175823016. Its totient is φ = 1144436419704.

The previous prime is 1239806121347. The next prime is 1239806121401. The reversal of 1239806121359 is 9531216089321.

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

It is a cyclic number.

It is not a de Polignac number, because 1239806121359 - 2²⁰ = 1239805072783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1239806121259) 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 in 3 ways as a sum of consecutive naturals, for example, 47684850809 + ... + 47684850834.

It is an arithmetic number, because the mean of its divisors is an integer number (333793955754).

Almost surely, 2^{1239806121359} is an apocalyptic number.

1239806121359 is a deficient number, since it is larger than the sum of its proper divisors (95369701657).

1239806121359 is an equidigital number, since it uses as much as digits as its factorization.

1239806121359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95369701656.

The product of its (nonzero) digits is 699840, while the sum is 50.

The spelling of 1239806121359 in words is "one trillion, two hundred thirty-nine billion, eight hundred six million, one hundred twenty-one thousand, three hundred fifty-nine".