127208896909 has 4 divisors (see below), whose sum is σ = 127210119516. Its totient is φ = 127207674304.

The previous prime is 127208896889. The next prime is 127208896931. The reversal of 127208896909 is 909698802721.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19196102500 + 108012794409 = 138550^2 + 328653^2 .

It is a cyclic number.

It is not a de Polignac number, because 127208896909 - 2¹³ = 127208888717 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 (127208896109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439054 + ... + 668719.

It is an arithmetic number, because the mean of its divisors is an integer number (31802529879).

Almost surely, 2^127208896909 is an apocalyptic number.

It is an amenable number.

127208896909 is a deficient number, since it is larger than the sum of its proper divisors (1222607).

127208896909 is a wasteful number, since it uses less digits than its factorization.

127208896909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222606.

The product of its (nonzero) digits is 7838208, while the sum is 61.

The spelling of 127208896909 in words is "one hundred twenty-seven billion, two hundred eight million, eight hundred ninety-six thousand, nine hundred nine".