127879909 has 2 divisors, whose sum is σ = 127879910. Its totient is φ = 127879908.

The previous prime is 127879889. The next prime is 127879919. The reversal of 127879909 is 909978721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97574884 + 30305025 = 9878^2 + 5505^2 .

It is a cyclic number.

It is not a de Polignac number, because 127879909 - 2⁵ = 127879877 is a prime.

It is a super-2 number, since 2×127879909² = 32706542251696562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127879919) 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 as a sum of consecutive naturals, namely, 63939954 + 63939955.

It is an arithmetic number, because the mean of its divisors is an integer number (63939955).

Almost surely, 2^127879909 is an apocalyptic number.

It is an amenable number.

127879909 is a deficient number, since it is larger than the sum of its proper divisors (1).

127879909 is an equidigital number, since it uses as much as digits as its factorization.

127879909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 571536, while the sum is 52.

The square root of 127879909 is about 11308.3999310247. The cubic root of 127879909 is about 503.8107610807.

The spelling of 127879909 in words is "one hundred twenty-seven million, eight hundred seventy-nine thousand, nine hundred nine".