9989749489 has 4 divisors (see below), whose sum is σ = 10033757424. Its totient is φ = 9945741556.

The previous prime is 9989749447. The next prime is 9989749537. The reversal of 9989749489 is 9849479899.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9989749489 - 2²³ = 9981360881 is a prime.

It is a super-2 number, since 2×9989749489² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9989749409) 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, 22003627 + ... + 22004080.

It is an arithmetic number, because the mean of its divisors is an integer number (2508439356).

Almost surely, 2^9989749489 is an apocalyptic number.

It is an amenable number.

9989749489 is a deficient number, since it is larger than the sum of its proper divisors (44007935).

9989749489 is a wasteful number, since it uses less digits than its factorization.

9989749489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44007934.

The product of its digits is 423263232, while the sum is 76.

The square root of 9989749489 is about 99948.7343041421. The cubic root of 9989749489 is about 2153.6983031468.

The spelling of 9989749489 in words is "nine billion, nine hundred eighty-nine million, seven hundred forty-nine thousand, four hundred eighty-nine".