990990149 has 2 divisors, whose sum is σ = 990990150. Its totient is φ = 990990148.

The previous prime is 990990127. The next prime is 990990173. The reversal of 990990149 is 941099099.

990990149 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 547887649 + 443102500 = 23407^2 + 21050^2 .

It is an emirp because it is prime and its reverse (941099099) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990990149 is a prime.

It is a super-2 number, since 2×990990149² = 1964122950830084402, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 990990097 and 990990106.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990890149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495495074 + 495495075.

It is an arithmetic number, because the mean of its divisors is an integer number (495495075).

Almost surely, 2^990990149 is an apocalyptic number.

It is an amenable number.

990990149 is a deficient number, since it is larger than the sum of its proper divisors (1).

990990149 is an equidigital number, since it uses as much as digits as its factorization.

990990149 is an odious number, because the sum of its binary digits is odd.

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

The square root of 990990149 is about 31479.9960133416. The cubic root of 990990149 is about 996.9876511996.

The spelling of 990990149 in words is "nine hundred ninety million, nine hundred ninety thousand, one hundred forty-nine".