2978845789 has 2 divisors, whose sum is σ = 2978845790. Its totient is φ = 2978845788.

The previous prime is 2978845787. The next prime is 2978845813. The reversal of 2978845789 is 9875488792.

2978845789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2690185689 + 288660100 = 51867^2 + 16990^2 .

It is a cyclic number.

It is not a de Polignac number, because 2978845789 - 2¹ = 2978845787 is a prime.

Together with 2978845787, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2978845787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1489422894 + 1489422895.

It is an arithmetic number, because the mean of its divisors is an integer number (1489422895).

Almost surely, 2^2978845789 is an apocalyptic number.

It is an amenable number.

2978845789 is a deficient number, since it is larger than the sum of its proper divisors (1).

2978845789 is an equidigital number, since it uses as much as digits as its factorization.

2978845789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81285120, while the sum is 67.

The square root of 2978845789 is about 54578.8034771742. The cubic root of 2978845789 is about 1438.8516096478.

The spelling of 2978845789 in words is "two billion, nine hundred seventy-eight million, eight hundred forty-five thousand, seven hundred eighty-nine".