978809759 has 2 divisors, whose sum is σ = 978809760. Its totient is φ = 978809758.

The previous prime is 978809659. The next prime is 978809761. The reversal of 978809759 is 957908879.

It is a strong prime.

It is an emirp because it is prime and its reverse (957908879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 978809759 - 2¹⁶ = 978744223 is a prime.

It is a Sophie Germain prime.

Together with 978809761, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978809059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489404879 + 489404880.

It is an arithmetic number, because the mean of its divisors is an integer number (489404880).

Almost surely, 2^978809759 is an apocalyptic number.

978809759 is a deficient number, since it is larger than the sum of its proper divisors (1).

978809759 is an equidigital number, since it uses as much as digits as its factorization.

978809759 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11430720, while the sum is 62.

The square root of 978809759 is about 31285.9354822578. The cubic root of 978809759 is about 992.8860987481.

The spelling of 978809759 in words is "nine hundred seventy-eight million, eight hundred nine thousand, seven hundred fifty-nine".