127664213 has 2 divisors, whose sum is σ = 127664214. Its totient is φ = 127664212.

The previous prime is 127664197. The next prime is 127664219. The reversal of 127664213 is 312466721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127283524 + 380689 = 11282^2 + 617^2 .

It is a cyclic number.

It is not a de Polignac number, because 127664213 - 2⁴ = 127664197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_7252961 and since 127664213 and 7252961 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 127664213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127664219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63832106 + 63832107.

It is an arithmetic number, because the mean of its divisors is an integer number (63832107).

Almost surely, 2^127664213 is an apocalyptic number.

It is an amenable number.

127664213 is a deficient number, since it is larger than the sum of its proper divisors (1).

127664213 is an equidigital number, since it uses as much as digits as its factorization.

127664213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 32.

The square root of 127664213 is about 11298.8589246879. The cubic root of 127664213 is about 503.5273412111.

The spelling of 127664213 in words is "one hundred twenty-seven million, six hundred sixty-four thousand, two hundred thirteen".