978149 has 2 divisors, whose sum is σ = 978150. Its totient is φ = 978148.

The previous prime is 978113. The next prime is 978151. The reversal of 978149 is 941879.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 940900 + 37249 = 970^2 + 193^2 .

It is an emirp because it is prime and its reverse (941879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 978149 - 2¹² = 974053 is a prime.

It is a Sophie Germain prime.

Together with 978151, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 978149.

It is not a weakly prime, because it can be changed into another prime (978179) 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, 489074 + 489075.

It is an arithmetic number, because the mean of its divisors is an integer number (489075).

2⁹⁷⁸¹⁴⁹ is an apocalyptic number.

It is an amenable number.

978149 is a deficient number, since it is larger than the sum of its proper divisors (1).

978149 is an equidigital number, since it uses as much as digits as its factorization.

978149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 38.

The square root of 978149 is about 989.0141556115. The cubic root of 978149 is about 99.2662627979.

The spelling of 978149 in words is "nine hundred seventy-eight thousand, one hundred forty-nine".