1272393545991 has 8 divisors (see below), whose sum is σ = 1702562183664. Its totient is φ = 845243636160.

The previous prime is 1272393545977. The next prime is 1272393546019. The reversal of 1272393545991 is 1995453932721.

It is a happy number.

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

It is not a de Polignac number, because 1272393545991 - 2¹⁹ = 1272393021703 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272393545911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 754680976 + ... + 754682661.

It is an arithmetic number, because the mean of its divisors is an integer number (212820272958).

Almost surely, 2^{1272393545991} is an apocalyptic number.

1272393545991 is a deficient number, since it is larger than the sum of its proper divisors (430168637673).

1272393545991 is a wasteful number, since it uses less digits than its factorization.

1272393545991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1509363921.

The product of its digits is 18370800, while the sum is 60.

The spelling of 1272393545991 in words is "one trillion, two hundred seventy-two billion, three hundred ninety-three million, five hundred forty-five thousand, nine hundred ninety-one".