978090979 has 2 divisors, whose sum is σ = 978090980. Its totient is φ = 978090978.

The previous prime is 978090977. The next prime is 978090983. The reversal of 978090979 is 979090879.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 978090979 - 2¹ = 978090977 is a prime.

Together with 978090977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (978090973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489045489 + 489045490.

It is an arithmetic number, because the mean of its divisors is an integer number (489045490).

Almost surely, 2^978090979 is an apocalyptic number.

978090979 is a deficient number, since it is larger than the sum of its proper divisors (1).

978090979 is an equidigital number, since it uses as much as digits as its factorization.

978090979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2571912, while the sum is 58.

The square root of 978090979 is about 31274.4461022094. The cubic root of 978090979 is about 992.6430002889.

The spelling of 978090979 in words is "nine hundred seventy-eight million, ninety thousand, nine hundred seventy-nine".