990144109 has 2 divisors, whose sum is σ = 990144110. Its totient is φ = 990144108.

The previous prime is 990144091. The next prime is 990144139. The reversal of 990144109 is 901441099.

990144109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (990144091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 706390084 + 283754025 = 26578^2 + 16845^2 .

It is a cyclic number.

It is not a de Polignac number, because 990144109 - 2¹¹ = 990142061 is a prime.

It is equal to p_50371696 and since 990144109 and 50371696 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990144139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495072054 + 495072055.

It is an arithmetic number, because the mean of its divisors is an integer number (495072055).

Almost surely, 2^990144109 is an apocalyptic number.

It is an amenable number.

990144109 is a deficient number, since it is larger than the sum of its proper divisors (1).

990144109 is an equidigital number, since it uses as much as digits as its factorization.

990144109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 990144109 is about 31466.5554041112. Note that the first 3 decimals coincide. The cubic root of 990144109 is about 996.7038503345.

The spelling of 990144109 in words is "nine hundred ninety million, one hundred forty-four thousand, one hundred nine".