127664429 has 2 divisors, whose sum is σ = 127664430. Its totient is φ = 127664428.

The previous prime is 127664389. The next prime is 127664437. The reversal of 127664429 is 924466721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126450025 + 1214404 = 11245^2 + 1102^2 .

It is an emirp because it is prime and its reverse (924466721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 127664429 - 2¹⁶ = 127598893 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127664129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63832214 + 63832215.

It is an arithmetic number, because the mean of its divisors is an integer number (63832215).

Almost surely, 2^127664429 is an apocalyptic number.

It is an amenable number.

127664429 is a deficient number, since it is larger than the sum of its proper divisors (1).

127664429 is an equidigital number, since it uses as much as digits as its factorization.

127664429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 41.

The square root of 127664429 is about 11298.8684831712. The cubic root of 127664429 is about 503.5276251900.

The spelling of 127664429 in words is "one hundred twenty-seven million, six hundred sixty-four thousand, four hundred twenty-nine".