988936769209 has 3 divisors (see below), whose sum is σ = 988937763663. Its totient is φ = 988935774756.

The previous prime is 988936769207. The next prime is 988936769213. The reversal of 988936769209 is 902967639889.

The square root of 988936769209 is 994453.

It is a perfect power (a square), and thus also a powerful number.

988936769209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 902967639889 = 7 ⋅128995377127.

It can be written as a sum of positive squares in only one way, i.e., 280693338025 + 708243431184 = 529805^2 + 841572^2 .

It is not a de Polignac number, because 988936769209 - 2¹ = 988936769207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (988936769207) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 497227 + ... + 1491679.

It is an arithmetic number, because the mean of its divisors is an integer number (329645921221).

Almost surely, 2^988936769209 is an apocalyptic number.

988936769209 is the 994453-rd square number.

988936769209 is the 497227-th centered octagonal number.

It is an amenable number.

988936769209 is a deficient number, since it is larger than the sum of its proper divisors (994454).

988936769209 is an frugal number, since it uses more digits than its factorization.

988936769209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1988906 (or 994453 counting only the distinct ones).

The product of its (nonzero) digits is 634894848, while the sum is 76.

The spelling of 988936769209 in words is "nine hundred eighty-eight billion, nine hundred thirty-six million, seven hundred sixty-nine thousand, two hundred nine".