999997999489 has 2 divisors, whose sum is σ = 999997999490. Its totient is φ = 999997999488.

The previous prime is 999997999487. The next prime is 999997999513. The reversal of 999997999489 is 984999799999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 527341749489 + 472656250000 = 726183^2 + 687500^2 .

It is a cyclic number.

It is not a de Polignac number, because 999997999489 - 2¹ = 999997999487 is a prime.

It is a super-2 number, since 2×999997999489² (a number of 25 digits) contains 22 as substring.

Together with 999997999487, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 999997999394 and 999997999403.

It is not a weakly prime, because it can be changed into another prime (999997999487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499998999744 + 499998999745.

It is an arithmetic number, because the mean of its divisors is an integer number (499998999745).

Almost surely, 2^999997999489 is an apocalyptic number.

It is an amenable number.

999997999489 is a deficient number, since it is larger than the sum of its proper divisors (1).

999997999489 is an equidigital number, since it uses as much as digits as its factorization.

999997999489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86782189536, while the sum is 100.

The spelling of 999997999489 in words is "nine hundred ninety-nine billion, nine hundred ninety-seven million, nine hundred ninety-nine thousand, four hundred eighty-nine".