127998961 has 2 divisors, whose sum is σ = 127998962. Its totient is φ = 127998960.

The previous prime is 127998943. The next prime is 127998971. The reversal of 127998961 is 169899721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109851361 + 18147600 = 10481^2 + 4260^2 .

It is a cyclic number.

It is not a de Polignac number, because 127998961 - 2⁵ = 127998929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 127998899 and 127998908.

It is not a weakly prime, because it can be changed into another prime (127998901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63999480 + 63999481.

It is an arithmetic number, because the mean of its divisors is an integer number (63999481).

Almost surely, 2^127998961 is an apocalyptic number.

It is an amenable number.

127998961 is a deficient number, since it is larger than the sum of its proper divisors (1).

127998961 is an equidigital number, since it uses as much as digits as its factorization.

127998961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 52.

The square root of 127998961 is about 11313.6625811450. The cubic root of 127998961 is about 503.9670563522.

The spelling of 127998961 in words is "one hundred twenty-seven million, nine hundred ninety-eight thousand, nine hundred sixty-one".