1191121107 has 8 divisors (see below), whose sum is σ = 1732539840. Its totient is φ = 721891560.

The previous prime is 1191121021. The next prime is 1191121117. The reversal of 1191121107 is 7011211911.

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

It is not a de Polignac number, because 1191121107 - 2¹⁰ = 1191120083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1191121117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18047257 + ... + 18047322.

It is an arithmetic number, because the mean of its divisors is an integer number (216567480).

Almost surely, 2^1191121107 is an apocalyptic number.

1191121107 is a deficient number, since it is larger than the sum of its proper divisors (541418733).

1191121107 is a wasteful number, since it uses less digits than its factorization.

1191121107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36094593.

The product of its (nonzero) digits is 126, while the sum is 24.

The square root of 1191121107 is about 34512.6224300617. The cubic root of 1191121107 is about 1060.0311807014.

The spelling of 1191121107 in words is "one billion, one hundred ninety-one million, one hundred twenty-one thousand, one hundred seven".