9156561389 has 2 divisors, whose sum is σ = 9156561390. Its totient is φ = 9156561388.

The previous prime is 9156561383. The next prime is 9156561409. The reversal of 9156561389 is 9831656519.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7334552164 + 1822009225 = 85642^2 + 42685^2 .

It is a cyclic number.

It is not a de Polignac number, because 9156561389 - 2⁴ = 9156561373 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9156561389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9156561383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4578280694 + 4578280695.

It is an arithmetic number, because the mean of its divisors is an integer number (4578280695).

Almost surely, 2^9156561389 is an apocalyptic number.

It is an amenable number.

9156561389 is a deficient number, since it is larger than the sum of its proper divisors (1).

9156561389 is an equidigital number, since it uses as much as digits as its factorization.

9156561389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1749600, while the sum is 53.

The square root of 9156561389 is about 95689.9231319578. The cubic root of 9156561389 is about 2092.0760632853.

The spelling of 9156561389 in words is "nine billion, one hundred fifty-six million, five hundred sixty-one thousand, three hundred eighty-nine".