1591221123159 has 8 divisors (see below), whose sum is σ = 2122438884720. Its totient is φ = 1060408721856.

The previous prime is 1591221123143. The next prime is 1591221123169. The reversal of 1591221123159 is 9513211221951.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1591221123159 - 2⁴ = 1591221123143 is a prime.

It is a super-2 number, since 2×1591221123159² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1591221123159.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1591221123169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101330904 + ... + 101346605.

It is an arithmetic number, because the mean of its divisors is an integer number (265304860590).

Almost surely, 2^{1591221123159} is an apocalyptic number.

1591221123159 is a deficient number, since it is larger than the sum of its proper divisors (531217761561).

1591221123159 is a wasteful number, since it uses less digits than its factorization.

1591221123159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202680129.

The product of its digits is 48600, while the sum is 42.

The spelling of 1591221123159 in words is "one trillion, five hundred ninety-one billion, two hundred twenty-one million, one hundred twenty-three thousand, one hundred fifty-nine".