9999000149 has 2 divisors, whose sum is σ = 9999000150. Its totient is φ = 9999000148.

The previous prime is 9999000133. The next prime is 9999000181. The reversal of 9999000149 is 9410009999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9683937649 + 315062500 = 98407^2 + 17750^2 .

It is a cyclic number.

It is not a de Polignac number, because 9999000149 - 2⁴ = 9999000133 is a prime.

It is a super-3 number, since 3×9999000149³ (a number of 31 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 9999000097 and 9999000106.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9999000119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999500074 + 4999500075.

It is an arithmetic number, because the mean of its divisors is an integer number (4999500075).

Almost surely, 2^9999000149 is an apocalyptic number.

It is an amenable number.

9999000149 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999000149 is an equidigital number, since it uses as much as digits as its factorization.

9999000149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 236196, while the sum is 50.

The square root of 9999000149 is about 99995.0006200310. Note that the first 3 decimals coincide. The cubic root of 9999000149 is about 2154.3628838493.

The spelling of 9999000149 in words is "nine billion, nine hundred ninety-nine million, one hundred forty-nine", and thus it is an aban number.