127978541 has 4 divisors (see below), whose sum is σ = 128176992. Its totient is φ = 127780092.

The previous prime is 127978531. The next prime is 127978553. The reversal of 127978541 is 145879721.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127978541 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 127978492 and 127978501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127978511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98255 + ... + 99548.

It is an arithmetic number, because the mean of its divisors is an integer number (32044248).

Almost surely, 2^127978541 is an apocalyptic number.

It is an amenable number.

127978541 is a deficient number, since it is larger than the sum of its proper divisors (198451).

127978541 is an equidigital number, since it uses as much as digits as its factorization.

127978541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198450.

The product of its digits is 141120, while the sum is 44.

The square root of 127978541 is about 11312.7600964575. The cubic root of 127978541 is about 503.9402552112.

The spelling of 127978541 in words is "one hundred twenty-seven million, nine hundred seventy-eight thousand, five hundred forty-one".