9831661389 has 64 divisors (see below), whose sum is σ = 16253809920. Its totient is φ = 5823498240.

The previous prime is 9831661381. The next prime is 9831661421.

9831661389 is a `hidden beast` number, since 9 + 8 + 3 + 16 + 613 + 8 + 9 = 666.

9831661389 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 9831661389 - 2³ = 9831661381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9831661381) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2447947 + ... + 2451959.

It is an arithmetic number, because the mean of its divisors is an integer number (253965780).

Almost surely, 2^9831661389 is an apocalyptic number.

9831661389 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

It is an amenable number.

9831661389 is a deficient number, since it is larger than the sum of its proper divisors (6422148531).

9831661389 is a wasteful number, since it uses less digits than its factorization.

9831661389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4219 (or 4213 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 54.

The square root of 9831661389 is about 99154.7345768219. The cubic root of 9831661389 is about 2142.2770612748.

The spelling of 9831661389 in words is "nine billion, eight hundred thirty-one million, six hundred sixty-one thousand, three hundred eighty-nine".