127649257 has 2 divisors, whose sum is σ = 127649258. Its totient is φ = 127649256.

The previous prime is 127649251. The next prime is 127649299. The reversal of 127649257 is 752946721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103550976 + 24098281 = 10176^2 + 4909^2 .

It is a cyclic number.

It is not a de Polignac number, because 127649257 - 2²³ = 119260649 is a prime.

It is not a weakly prime, because it can be changed into another prime (127649251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63824628 + 63824629.

It is an arithmetic number, because the mean of its divisors is an integer number (63824629).

Almost surely, 2^127649257 is an apocalyptic number.

It is an amenable number.

127649257 is a deficient number, since it is larger than the sum of its proper divisors (1).

127649257 is an equidigital number, since it uses as much as digits as its factorization.

127649257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 43.

The square root of 127649257 is about 11298.1970685592. The cubic root of 127649257 is about 503.5076775198.

The spelling of 127649257 in words is "one hundred twenty-seven million, six hundred forty-nine thousand, two hundred fifty-seven".