989898149 has 2 divisors, whose sum is σ = 989898150. Its totient is φ = 989898148.

The previous prime is 989898131. The next prime is 989898163. The reversal of 989898149 is 941898989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 566773249 + 423124900 = 23807^2 + 20570^2 .

It is a cyclic number.

It is not a de Polignac number, because 989898149 - 2⁸ = 989897893 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989892149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494949074 + 494949075.

It is an arithmetic number, because the mean of its divisors is an integer number (494949075).

Almost surely, 2^989898149 is an apocalyptic number.

It is an amenable number.

989898149 is a deficient number, since it is larger than the sum of its proper divisors (1).

989898149 is an equidigital number, since it uses as much as digits as its factorization.

989898149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13436928, while the sum is 65.

The square root of 989898149 is about 31462.6468848379. The cubic root of 989898149 is about 996.6213136685.

The spelling of 989898149 in words is "nine hundred eighty-nine million, eight hundred ninety-eight thousand, one hundred forty-nine".