127531979 has 2 divisors, whose sum is σ = 127531980. Its totient is φ = 127531978.

The previous prime is 127531919. The next prime is 127532063. The reversal of 127531979 is 979135721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 127531979 - 2²⁰ = 126483403 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (127531919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63765989 + 63765990.

It is an arithmetic number, because the mean of its divisors is an integer number (63765990).

Almost surely, 2^127531979 is an apocalyptic number.

127531979 is a deficient number, since it is larger than the sum of its proper divisors (1).

127531979 is an equidigital number, since it uses as much as digits as its factorization.

127531979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 119070, while the sum is 44.

The square root of 127531979 is about 11293.0057557764. The cubic root of 127531979 is about 503.3534307234.

The spelling of 127531979 in words is "one hundred twenty-seven million, five hundred thirty-one thousand, nine hundred seventy-nine".