127189649 has 2 divisors, whose sum is σ = 127189650. Its totient is φ = 127189648.

The previous prime is 127189639. The next prime is 127189687. The reversal of 127189649 is 946981721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81721600 + 45468049 = 9040^2 + 6743^2 .

It is a cyclic number.

It is not a de Polignac number, because 127189649 - 2²⁰ = 126141073 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (127189619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63594824 + 63594825.

It is an arithmetic number, because the mean of its divisors is an integer number (63594825).

Almost surely, 2^127189649 is an apocalyptic number.

It is an amenable number.

127189649 is a deficient number, since it is larger than the sum of its proper divisors (1).

127189649 is an equidigital number, since it uses as much as digits as its factorization.

127189649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 47.

The square root of 127189649 is about 11277.8388443886. The cubic root of 127189649 is about 502.9026486537.

The spelling of 127189649 in words is "one hundred twenty-seven million, one hundred eighty-nine thousand, six hundred forty-nine".