127100505409 has 2 divisors, whose sum is σ = 127100505410. Its totient is φ = 127100505408.

The previous prime is 127100505383. The next prime is 127100505439. The reversal of 127100505409 is 904505001721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116586053809 + 10514451600 = 341447^2 + 102540^2 .

It is an emirp because it is prime and its reverse (904505001721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 127100505409 - 2³³ = 118510570817 is a prime.

It is not a weakly prime, because it can be changed into another prime (127100505439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63550252704 + 63550252705.

It is an arithmetic number, because the mean of its divisors is an integer number (63550252705).

Almost surely, 2^127100505409 is an apocalyptic number.

It is an amenable number.

127100505409 is a deficient number, since it is larger than the sum of its proper divisors (1).

127100505409 is an equidigital number, since it uses as much as digits as its factorization.

127100505409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12600, while the sum is 34.

The spelling of 127100505409 in words is "one hundred twenty-seven billion, one hundred million, five hundred five thousand, four hundred nine".