1272727909091 has 4 divisors (see below), whose sum is σ = 1316615078400. Its totient is φ = 1228840739784.

The previous prime is 1272727909087. The next prime is 1272727909171. The reversal of 1272727909091 is 1909097272721.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1272727909091 - 2² = 1272727909087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1272727909021) 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, 21943584611 + ... + 21943584668.

It is an arithmetic number, because the mean of its divisors is an integer number (329153769600).

Almost surely, 2^{1272727909091} is an apocalyptic number.

1272727909091 is a deficient number, since it is larger than the sum of its proper divisors (43887169309).

1272727909091 is an equidigital number, since it uses as much as digits as its factorization.

1272727909091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43887169308.

The product of its (nonzero) digits is 2000376, while the sum is 56.

The spelling of 1272727909091 in words is "one trillion, two hundred seventy-two billion, seven hundred twenty-seven million, nine hundred nine thousand, ninety-one".