978990773 has 2 divisors, whose sum is σ = 978990774. Its totient is φ = 978990772.

The previous prime is 978990737. The next prime is 978990797. The reversal of 978990773 is 377099879.

Together with previous prime (978990737) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 787251364 + 191739409 = 28058^2 + 13847^2 .

It is a cyclic number.

It is not a de Polignac number, because 978990773 - 2¹⁶ = 978925237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978990703) 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, 489495386 + 489495387.

It is an arithmetic number, because the mean of its divisors is an integer number (489495387).

Almost surely, 2^978990773 is an apocalyptic number.

It is an amenable number.

978990773 is a deficient number, since it is larger than the sum of its proper divisors (1).

978990773 is an equidigital number, since it uses as much as digits as its factorization.

978990773 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6001128, while the sum is 59.

The square root of 978990773 is about 31288.8282458772. The cubic root of 978990773 is about 992.9473007010.

The spelling of 978990773 in words is "nine hundred seventy-eight million, nine hundred ninety thousand, seven hundred seventy-three".