987918991879 has 4 divisors (see below), whose sum is σ = 988026069384. Its totient is φ = 987811914376.

The previous prime is 987918991877. The next prime is 987918991897. The reversal of 987918991879 is 978199819789.

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 987918991879 - 2¹ = 987918991877 is a prime.

It is a super-3 number, since 3×987918991879³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 987918991796 and 987918991805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987918991877) 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, 53524912 + ... + 53543365.

It is an arithmetic number, because the mean of its divisors is an integer number (247006517346).

Almost surely, 2^987918991879 is an apocalyptic number.

987918991879 is a deficient number, since it is larger than the sum of its proper divisors (107077505).

987918991879 is a wasteful number, since it uses less digits than its factorization.

987918991879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107077504.

The product of its digits is 1481421312, while the sum is 85.

The spelling of 987918991879 in words is "nine hundred eighty-seven billion, nine hundred eighteen million, nine hundred ninety-one thousand, eight hundred seventy-nine".