9781239073 has 2 divisors, whose sum is σ = 9781239074. Its totient is φ = 9781239072.

The previous prime is 9781239019. The next prime is 9781239079. The reversal of 9781239073 is 3709321879.

9781239073 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9755907984 + 25331089 = 98772^2 + 5033^2 .

It is a cyclic number.

It is not a de Polignac number, because 9781239073 - 2²⁵ = 9747684641 is a prime.

It is not a weakly prime, because it can be changed into another prime (9781239079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4890619536 + 4890619537.

It is an arithmetic number, because the mean of its divisors is an integer number (4890619537).

Almost surely, 2^9781239073 is an apocalyptic number.

It is an amenable number.

9781239073 is a deficient number, since it is larger than the sum of its proper divisors (1).

9781239073 is an equidigital number, since it uses as much as digits as its factorization.

9781239073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 571536, while the sum is 49.

The square root of 9781239073 is about 98900.1469816906. The cubic root of 9781239073 is about 2138.6085134850.

The spelling of 9781239073 in words is "nine billion, seven hundred eighty-one million, two hundred thirty-nine thousand, seventy-three".