1181747897989 has 16 divisors (see below), whose sum is σ = 1196135620992. Its totient is φ = 1167419708928.

The previous prime is 1181747897969. The next prime is 1181747897999. The reversal of 1181747897989 is 9897987471811.

It is a cyclic number.

It is not a de Polignac number, because 1181747897989 - 2¹³ = 1181747889797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181747897969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77165197 + ... + 77180509.

It is an arithmetic number, because the mean of its divisors is an integer number (74758476312).

Almost surely, 2^{1181747897989} is an apocalyptic number.

It is an amenable number.

1181747897989 is a deficient number, since it is larger than the sum of its proper divisors (14387723003).

1181747897989 is a wasteful number, since it uses less digits than its factorization.

1181747897989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17196.

The product of its digits is 512096256, while the sum is 79.

The spelling of 1181747897989 in words is "one trillion, one hundred eighty-one billion, seven hundred forty-seven million, eight hundred ninety-seven thousand, nine hundred eighty-nine".