127643641 has 4 divisors (see below), whose sum is σ = 127704400. Its totient is φ = 127582884.

The previous prime is 127643569. The next prime is 127643683. The reversal of 127643641 is 146346721.

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, and also an emirpimes, since its reverse is a distinct semiprime: 146346721 = 19 ⋅7702459.

It is a cyclic number.

It is not a de Polignac number, because 127643641 - 2⁹ = 127643129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 127643597 and 127643606.

It is not an unprimeable number, because it can be changed into a prime (127643141) 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, 27111 + ... + 31468.

It is an arithmetic number, because the mean of its divisors is an integer number (31926100).

Almost surely, 2^127643641 is an apocalyptic number.

It is an amenable number.

127643641 is a deficient number, since it is larger than the sum of its proper divisors (60759).

127643641 is an equidigital number, since it uses as much as digits as its factorization.

127643641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60758.

The product of its digits is 24192, while the sum is 34.

The square root of 127643641 is about 11297.9485305962. The cubic root of 127643641 is about 503.5002933782.

The spelling of 127643641 in words is "one hundred twenty-seven million, six hundred forty-three thousand, six hundred forty-one".