987127721789 has 16 divisors (see below), whose sum is σ = 1087928464896. Its totient is φ = 888186020400.

The previous prime is 987127721773. The next prime is 987127721791.

It is a happy number.

987127721789 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 987127721789 - 2⁴ = 987127721773 is a prime.

It is a super-2 number, since 2×987127721789² (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 (987127721719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 899744 + ... + 1668470.

It is an arithmetic number, because the mean of its divisors is an integer number (67995529056).

Almost surely, 2^987127721789 is an apocalyptic number.

It is an amenable number.

987127721789 is a deficient number, since it is larger than the sum of its proper divisors (100800743107).

987127721789 is a wasteful number, since it uses less digits than its factorization.

987127721789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769936.

The product of its digits is 49787136, while the sum is 68.

The spelling of 987127721789 in words is "nine hundred eighty-seven billion, one hundred twenty-seven million, seven hundred twenty-one thousand, seven hundred eighty-nine".