1272201209 has 4 divisors (see below), whose sum is σ = 1272682320. Its totient is φ = 1271720100.

The previous prime is 1272201199. The next prime is 1272201211. The reversal of 1272201209 is 9021022721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1272201209 - 2¹⁶ = 1272135673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1272201289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236567 + ... + 241884.

It is an arithmetic number, because the mean of its divisors is an integer number (318170580).

Almost surely, 2^1272201209 is an apocalyptic number.

It is an amenable number.

1272201209 is a deficient number, since it is larger than the sum of its proper divisors (481111).

1272201209 is an equidigital number, since it uses as much as digits as its factorization.

1272201209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481110.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 1272201209 is about 35667.9296988205. The cubic root of 1272201209 is about 1083.5574304898.

The spelling of 1272201209 in words is "one billion, two hundred seventy-two million, two hundred one thousand, two hundred nine".