1209201091 has 8 divisors (see below), whose sum is σ = 1382203904. Its totient is φ = 1036263240.

The previous prime is 1209201083. The next prime is 1209201131. The reversal of 1209201091 is 1901029021.

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 1209201091 - 2³ = 1209201083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1209201001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34036 + ... + 59806.

It is an arithmetic number, because the mean of its divisors is an integer number (172775488).

Almost surely, 2^1209201091 is an apocalyptic number.

1209201091 is a deficient number, since it is larger than the sum of its proper divisors (173002813).

1209201091 is an equidigital number, since it uses as much as digits as its factorization.

1209201091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32481.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 1209201091 is about 34773.5688562448. The cubic root of 1209201091 is about 1065.3676619322.

The spelling of 1209201091 in words is "one billion, two hundred nine million, two hundred one thousand, ninety-one".