986121383121689 has 4 divisors (see below), whose sum is σ = 986121457965924. Its totient is φ = 986121308277456.

The previous prime is 986121383121673. The next prime is 986121383121701.

986121383121689 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 213337426905625 + 772783956216064 = 14606075^2 + 27798992^2 .

It is a cyclic number.

It is not a de Polignac number, because 986121383121689 - 2⁴ = 986121383121673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (986121383121089) 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, 11820242 + ... + 45956075.

It is an arithmetic number, because the mean of its divisors is an integer number (246530364491481).

Almost surely, 2^{986121383121689} is an apocalyptic number.

It is an amenable number.

986121383121689 is a deficient number, since it is larger than the sum of its proper divisors (74844235).

986121383121689 is a wasteful number, since it uses less digits than its factorization.

986121383121689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74844234.

The product of its digits is 53747712, while the sum is 68.

The spelling of 986121383121689 in words is "nine hundred eighty-six trillion, one hundred twenty-one billion, three hundred eighty-three million, one hundred twenty-one thousand, six hundred eighty-nine".