1188891121 has 8 divisors (see below), whose sum is σ = 1302541344. Its totient is φ = 1076169120.

The previous prime is 1188891113. The next prime is 1188891149. The reversal of 1188891121 is 1211988811.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1188891121 - 2³ = 1188891113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1188891421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 229371 + ... + 234496.

It is an arithmetic number, because the mean of its divisors is an integer number (162817668).

Almost surely, 2^1188891121 is an apocalyptic number.

1188891121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1188891121 is a deficient number, since it is larger than the sum of its proper divisors (113650223).

1188891121 is a wasteful number, since it uses less digits than its factorization.

1188891121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464111.

The product of its digits is 9216, while the sum is 40.

The square root of 1188891121 is about 34480.3004772290. The cubic root of 1188891121 is about 1059.3692464958.

The spelling of 1188891121 in words is "one billion, one hundred eighty-eight million, eight hundred ninety-one thousand, one hundred twenty-one".