978504949 has 2 divisors, whose sum is σ = 978504950. Its totient is φ = 978504948.

The previous prime is 978504941. The next prime is 978504977. The reversal of 978504949 is 949405879.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 609596100 + 368908849 = 24690^2 + 19207^2 .

It is a cyclic number.

It is not a de Polignac number, because 978504949 - 2³ = 978504941 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 978504949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978504941) 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, 489252474 + 489252475.

It is an arithmetic number, because the mean of its divisors is an integer number (489252475).

Almost surely, 2^978504949 is an apocalyptic number.

It is an amenable number.

978504949 is a deficient number, since it is larger than the sum of its proper divisors (1).

978504949 is an equidigital number, since it uses as much as digits as its factorization.

978504949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The square root of 978504949 is about 31281.0637447002. The cubic root of 978504949 is about 992.7830235490.

The spelling of 978504949 in words is "nine hundred seventy-eight million, five hundred four thousand, nine hundred forty-nine".