996861689 has 6 divisors (see below), whose sum is σ = 1032422430. Its totient is φ = 962486336.

The previous prime is 996861641. The next prime is 996861721. The reversal of 996861689 is 986168699.

It can be written as a sum of positive squares in 3 ways, for example, as 259467664 + 737394025 = 16108^2 + 27155^2 .

It is not a de Polignac number, because 996861689 - 2¹² = 996857593 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (996861889) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 591824 + ... + 593505.

It is an arithmetic number, because the mean of its divisors is an integer number (172070405).

Almost surely, 2^996861689 is an apocalyptic number.

It is an amenable number.

996861689 is a deficient number, since it is larger than the sum of its proper divisors (35560741).

996861689 is a wasteful number, since it uses less digits than its factorization.

996861689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1185387 (or 1185358 counting only the distinct ones).

The product of its digits is 10077696, while the sum is 62.

The square root of 996861689 is about 31573.1165550694. The cubic root of 996861689 is about 998.9528000885.

The spelling of 996861689 in words is "nine hundred ninety-six million, eight hundred sixty-one thousand, six hundred eighty-nine".