1189215728487 has 8 divisors (see below), whose sum is σ = 1761801079280. Its totient is φ = 792810485640.

The previous prime is 1189215728473. The next prime is 1189215728497. The reversal of 1189215728487 is 7848275129811.

1189215728487 is a `hidden beast` number, since 1 + 1 + 89 + 2 + 1 + 5 + 72 + 8 + 487 = 666.

It is not a de Polignac number, because 1189215728487 - 2¹⁶ = 1189215662951 is a prime.

It is a super-2 number, since 2×1189215728487² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1189215728497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22022513464 + ... + 22022513517.

It is an arithmetic number, because the mean of its divisors is an integer number (220225134910).

Almost surely, 2^{1189215728487} is an apocalyptic number.

1189215728487 is a deficient number, since it is larger than the sum of its proper divisors (572585350793).

1189215728487 is an equidigital number, since it uses as much as digits as its factorization.

1189215728487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44045026990 (or 44045026984 counting only the distinct ones).

The product of its digits is 18063360, while the sum is 63.

The spelling of 1189215728487 in words is "one trillion, one hundred eighty-nine billion, two hundred fifteen million, seven hundred twenty-eight thousand, four hundred eighty-seven".