127999901 has 2 divisors, whose sum is σ = 127999902. Its totient is φ = 127999900.

The previous prime is 127999897. The next prime is 127999933. The reversal of 127999901 is 109999721.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88924900 + 39075001 = 9430^2 + 6251^2 .

It is a cyclic number.

It is not a de Polignac number, because 127999901 - 2² = 127999897 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127999951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63999950 + 63999951.

It is an arithmetic number, because the mean of its divisors is an integer number (63999951).

Almost surely, 2^127999901 is an apocalyptic number.

It is an amenable number.

127999901 is a deficient number, since it is larger than the sum of its proper divisors (1).

127999901 is an equidigital number, since it uses as much as digits as its factorization.

127999901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 91854, while the sum is 47.

The square root of 127999901 is about 11313.7041237607. The cubic root of 127999901 is about 503.9682900286.

The spelling of 127999901 in words is "one hundred twenty-seven million, nine hundred ninety-nine thousand, nine hundred one".