127649789 has 2 divisors, whose sum is σ = 127649790. Its totient is φ = 127649788.

The previous prime is 127649779. The next prime is 127649801. The reversal of 127649789 is 987946721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112572100 + 15077689 = 10610^2 + 3883^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127649789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 127649789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127649729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63824894 + 63824895.

It is an arithmetic number, because the mean of its divisors is an integer number (63824895).

Almost surely, 2^127649789 is an apocalyptic number.

It is an amenable number.

127649789 is a deficient number, since it is larger than the sum of its proper divisors (1).

127649789 is an equidigital number, since it uses as much as digits as its factorization.

127649789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 53.

The square root of 127649789 is about 11298.2206121141. The cubic root of 127649789 is about 503.5083770035.

The spelling of 127649789 in words is "one hundred twenty-seven million, six hundred forty-nine thousand, seven hundred eighty-nine".