127664437 has 2 divisors, whose sum is σ = 127664438. Its totient is φ = 127664436.

The previous prime is 127664429. The next prime is 127664491. The reversal of 127664437 is 734466721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126202756 + 1461681 = 11234^2 + 1209^2 .

It is an emirp because it is prime and its reverse (734466721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 127664437 - 2³ = 127664429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 127664437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127664137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63832218 + 63832219.

It is an arithmetic number, because the mean of its divisors is an integer number (63832219).

Almost surely, 2^127664437 is an apocalyptic number.

It is an amenable number.

127664437 is a deficient number, since it is larger than the sum of its proper divisors (1).

127664437 is an equidigital number, since it uses as much as digits as its factorization.

127664437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 40.

The square root of 127664437 is about 11298.8688371890. The cubic root of 127664437 is about 503.5276357078.

The spelling of 127664437 in words is "one hundred twenty-seven million, six hundred sixty-four thousand, four hundred thirty-seven".