9789172049 has 2 divisors, whose sum is σ = 9789172050. Its totient is φ = 9789172048.

The previous prime is 9789172007. The next prime is 9789172087. The reversal of 9789172049 is 9402719879.

9789172049 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., 6649587025 + 3139585024 = 81545^2 + 56032^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9789172049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9789171985 and 9789172003.

It is not a weakly prime, because it can be changed into another prime (9789172949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4894586024 + 4894586025.

It is an arithmetic number, because the mean of its divisors is an integer number (4894586025).

Almost surely, 2^9789172049 is an apocalyptic number.

It is an amenable number.

9789172049 is a deficient number, since it is larger than the sum of its proper divisors (1).

9789172049 is an equidigital number, since it uses as much as digits as its factorization.

9789172049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2286144, while the sum is 56.

The square root of 9789172049 is about 98940.2448400043. The cubic root of 9789172049 is about 2139.1865229231.

The spelling of 9789172049 in words is "nine billion, seven hundred eighty-nine million, one hundred seventy-two thousand, forty-nine".