127644121 has 4 divisors (see below), whose sum is σ = 139248144. Its totient is φ = 116040100.

The previous prime is 127644119. The next prime is 127644131. The reversal of 127644121 is 121446721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 127644121 - 2¹ = 127644119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 127644121.

It is not an unprimeable number, because it can be changed into a prime (127644131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5801995 + ... + 5802016.

It is an arithmetic number, because the mean of its divisors is an integer number (34812036).

Almost surely, 2^127644121 is an apocalyptic number.

127644121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

127644121 is a deficient number, since it is larger than the sum of its proper divisors (11604023).

127644121 is a wasteful number, since it uses less digits than its factorization.

127644121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11604022.

The product of its digits is 2688, while the sum is 28.

The square root of 127644121 is about 11297.9697733708. The cubic root of 127644121 is about 503.5009245098.

It can be divided in two parts, 127644 and 121, that added together give a triangular number (127765 = T₅₀₅).

The spelling of 127644121 in words is "one hundred twenty-seven million, six hundred forty-four thousand, one hundred twenty-one".