1189215728489 has 4 divisors (see below), whose sum is σ = 1211653761156. Its totient is φ = 1166777695824.

The previous prime is 1189215728473. The next prime is 1189215728497. The reversal of 1189215728489 is 9848275129811.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 646282542889 + 542933185600 = 803917^2 + 736840^2 .

It is a cyclic number.

It is not a de Polignac number, because 1189215728489 - 2⁴ = 1189215728473 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1189215928489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11219016254 + ... + 11219016359.

It is an arithmetic number, because the mean of its divisors is an integer number (302913440289).

Almost surely, 2^{1189215728489} is an apocalyptic number.

It is an amenable number.

1189215728489 is a deficient number, since it is larger than the sum of its proper divisors (22438032667).

1189215728489 is an equidigital number, since it uses as much as digits as its factorization.

1189215728489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22438032666.

The product of its digits is 23224320, while the sum is 65.

The spelling of 1189215728489 in words is "one trillion, one hundred eighty-nine billion, two hundred fifteen million, seven hundred twenty-eight thousand, four hundred eighty-nine".