1587998651989 has 4 divisors (see below), whose sum is σ = 1591958748780. Its totient is φ = 1584038555200.

The previous prime is 1587998651933. The next prime is 1587998652041. The reversal of 1587998651989 is 9891568997851.

It is a happy number.

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 1192933606225 + 395065045764 = 1092215^2 + 628542^2 .

It is a cyclic number.

It is not a de Polignac number, because 1587998651989 - 2⁷ = 1587998651861 is a prime.

It is a super-2 number, since 2×1587998651989² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1587998651929) 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, 1980047794 + ... + 1980048595.

It is an arithmetic number, because the mean of its divisors is an integer number (397989687195).

Almost surely, 2^{1587998651989} is an apocalyptic number.

It is an amenable number.

1587998651989 is a deficient number, since it is larger than the sum of its proper divisors (3960096791).

1587998651989 is an equidigital number, since it uses as much as digits as its factorization.

1587998651989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3960096790.

The product of its digits is 3527193600, while the sum is 85.

The spelling of 1587998651989 in words is "one trillion, five hundred eighty-seven billion, nine hundred ninety-eight million, six hundred fifty-one thousand, nine hundred eighty-nine".