989678149 has 2 divisors, whose sum is σ = 989678150. Its totient is φ = 989678148.

The previous prime is 989678101. The next prime is 989678161. The reversal of 989678149 is 941876989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 840594049 + 149084100 = 28993^2 + 12210^2 .

It is an emirp because it is prime and its reverse (941876989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 989678149 - 2¹³ = 989669957 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 (989678549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494839074 + 494839075.

It is an arithmetic number, because the mean of its divisors is an integer number (494839075).

Almost surely, 2^989678149 is an apocalyptic number.

It is an amenable number.

989678149 is a deficient number, since it is larger than the sum of its proper divisors (1).

989678149 is an equidigital number, since it uses as much as digits as its factorization.

989678149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7838208, while the sum is 61.

The square root of 989678149 is about 31459.1504812193. The cubic root of 989678149 is about 996.5474768015.

The spelling of 989678149 in words is "nine hundred eighty-nine million, six hundred seventy-eight thousand, one hundred forty-nine".