1272128959 has 4 divisors (see below), whose sum is σ = 1272708616. Its totient is φ = 1271549304.

The previous prime is 1272128947. The next prime is 1272128969. The reversal of 1272128959 is 9598212721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9598212721 = 3361 ⋅2855761.

It is a cyclic number.

It is not a de Polignac number, because 1272128959 - 2²⁷ = 1137911231 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 (1272128929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 286524 + ... + 290929.

It is an arithmetic number, because the mean of its divisors is an integer number (318177154).

Almost surely, 2^1272128959 is an apocalyptic number.

1272128959 is a deficient number, since it is larger than the sum of its proper divisors (579657).

1272128959 is an equidigital number, since it uses as much as digits as its factorization.

1272128959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579656.

The product of its digits is 181440, while the sum is 46.

The square root of 1272128959 is about 35666.9168698389. The cubic root of 1272128959 is about 1083.5369178785.

The spelling of 1272128959 in words is "one billion, two hundred seventy-two million, one hundred twenty-eight thousand, nine hundred fifty-nine".