1189121001 has 8 divisors (see below), whose sum is σ = 1585669440. Its totient is φ = 792659952.

The previous prime is 1189120979. The next prime is 1189121027. The reversal of 1189121001 is 1001219811.

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

It is not a de Polignac number, because 1189121001 - 2⁵ = 1189120969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1189121041) 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, 23140 + ... + 53978.

It is an arithmetic number, because the mean of its divisors is an integer number (198208680).

Almost surely, 2^1189121001 is an apocalyptic number.

It is an amenable number.

1189121001 is a deficient number, since it is larger than the sum of its proper divisors (396548439).

1189121001 is a wasteful number, since it uses less digits than its factorization.

1189121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43695.

The product of its (nonzero) digits is 144, while the sum is 24.

The square root of 1189121001 is about 34483.6338137384. The cubic root of 1189121001 is about 1059.4375207905.

The spelling of 1189121001 in words is "one billion, one hundred eighty-nine million, one hundred twenty-one thousand, one".