127231208509 has 4 divisors (see below), whose sum is σ = 127236248316. Its totient is φ = 127226168704.

The previous prime is 127231208501. The next prime is 127231208527. The reversal of 127231208509 is 905802132721.

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 17486095225 + 109745113284 = 132235^2 + 331278^2 .

It is a cyclic number.

It is not a de Polignac number, because 127231208509 - 2³ = 127231208501 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127231208501) 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, 2481844 + ... + 2532589.

It is an arithmetic number, because the mean of its divisors is an integer number (31809062079).

Almost surely, 2^127231208509 is an apocalyptic number.

It is an amenable number.

127231208509 is a deficient number, since it is larger than the sum of its proper divisors (5039807).

127231208509 is an equidigital number, since it uses as much as digits as its factorization.

127231208509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5039806.

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 127231208509 in words is "one hundred twenty-seven billion, two hundred thirty-one million, two hundred eight thousand, five hundred nine".