127649801 has 2 divisors, whose sum is σ = 127649802. Its totient is φ = 127649800.

The previous prime is 127649789. The next prime is 127649803. The reversal of 127649801 is 108946721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127125625 + 524176 = 11275^2 + 724^2 .

It is a cyclic number.

It is not a de Polignac number, because 127649801 - 2⁶ = 127649737 is a prime.

Together with 127649803, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (127649803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63824900 + 63824901.

It is an arithmetic number, because the mean of its divisors is an integer number (63824901).

Almost surely, 2^127649801 is an apocalyptic number.

It is an amenable number.

127649801 is a deficient number, since it is larger than the sum of its proper divisors (1).

127649801 is an equidigital number, since it uses as much as digits as its factorization.

127649801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 127649801 is about 11298.2211431712. The cubic root of 127649801 is about 503.5083927813.

The spelling of 127649801 in words is "one hundred twenty-seven million, six hundred forty-nine thousand, eight hundred one".