989509891499 has 4 divisors (see below), whose sum is σ = 990440757936. Its totient is φ = 988579025064.

The previous prime is 989509891483. The next prime is 989509891507. The reversal of 989509891499 is 994198905989.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 989509891499 - 2⁴ = 989509891483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (989509891429) 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, 465431624 + ... + 465433749.

It is an arithmetic number, because the mean of its divisors is an integer number (247610189484).

Almost surely, 2^989509891499 is an apocalyptic number.

989509891499 is a deficient number, since it is larger than the sum of its proper divisors (930866437).

989509891499 is a wasteful number, since it uses less digits than its factorization.

989509891499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930866436.

The product of its (nonzero) digits is 680244480, while the sum is 80.

The spelling of 989509891499 in words is "nine hundred eighty-nine billion, five hundred nine million, eight hundred ninety-one thousand, four hundred ninety-nine".