1189611812161 has 4 divisors (see below), whose sum is σ = 1198978834432. Its totient is φ = 1180244789892.

The previous prime is 1189611812119. The next prime is 1189611812173. The reversal of 1189611812161 is 1612181169811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1189611812161 - 2⁹ = 1189611811649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1189611882161) 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, 4683510945 + ... + 4683511198.

It is an arithmetic number, because the mean of its divisors is an integer number (299744708608).

Almost surely, 2^{1189611812161} is an apocalyptic number.

It is an amenable number.

1189611812161 is a deficient number, since it is larger than the sum of its proper divisors (9367022271).

1189611812161 is an equidigital number, since it uses as much as digits as its factorization.

1189611812161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9367022270.

The product of its digits is 41472, while the sum is 46.

The spelling of 1189611812161 in words is "one trillion, one hundred eighty-nine billion, six hundred eleven million, eight hundred twelve thousand, one hundred sixty-one".