1189209901 has 16 divisors (see below), whose sum is σ = 1322870400. Its totient is φ = 1068846240.

The previous prime is 1189209887. The next prime is 1189209929. The reversal of 1189209901 is 1099029811.

It is not a de Polignac number, because 1189209901 - 2⁵ = 1189209869 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 (1189206901) 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 15 ways as a sum of consecutive naturals, for example, 113440 + ... + 123478.

It is an arithmetic number, because the mean of its divisors is an integer number (82679400).

Almost surely, 2^1189209901 is an apocalyptic number.

1189209901 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1189209901 is a deficient number, since it is larger than the sum of its proper divisors (133660499).

1189209901 is an equidigital number, since it uses as much as digits as its factorization.

1189209901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10161 (or 10139 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 40.

The square root of 1189209901 is about 34484.9228069311. The cubic root of 1189209901 is about 1059.4639217058.

It can be divided in two parts, 118920 and 9901, that added together give a palindrome (128821).

The spelling of 1189209901 in words is "one billion, one hundred eighty-nine million, two hundred nine thousand, nine hundred one".