978883771 has 2 divisors, whose sum is σ = 978883772. Its totient is φ = 978883770.

The previous prime is 978883753. The next prime is 978883813. The reversal of 978883771 is 177388879.

It is a weak prime.

It is an emirp because it is prime and its reverse (177388879) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-978883771 is a prime.

It is not a weakly prime, because it can be changed into another prime (978883571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489441885 + 489441886.

It is an arithmetic number, because the mean of its divisors is an integer number (489441886).

Almost surely, 2^978883771 is an apocalyptic number.

978883771 is a deficient number, since it is larger than the sum of its proper divisors (1).

978883771 is an equidigital number, since it uses as much as digits as its factorization.

978883771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4741632, while the sum is 58.

The square root of 978883771 is about 31287.1182917187. The cubic root of 978883771 is about 992.9111235748.

The spelling of 978883771 in words is "nine hundred seventy-eight million, eight hundred eighty-three thousand, seven hundred seventy-one".