127201681 has 2 divisors, whose sum is σ = 127201682. Its totient is φ = 127201680.

The previous prime is 127201673. The next prime is 127201703. The reversal of 127201681 is 186102721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65044225 + 62157456 = 8065^2 + 7884^2 .

It is a cyclic number.

It is not a de Polignac number, because 127201681 - 2³ = 127201673 is a prime.

It is a super-2 number, since 2×127201681² = 32360535298451522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (127201621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63600840 + 63600841.

It is an arithmetic number, because the mean of its divisors is an integer number (63600841).

Almost surely, 2^127201681 is an apocalyptic number.

It is an amenable number.

127201681 is a deficient number, since it is larger than the sum of its proper divisors (1).

127201681 is an equidigital number, since it uses as much as digits as its factorization.

127201681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 127201681 is about 11278.3722673088. The cubic root of 127201681 is about 502.9185061650.

The spelling of 127201681 in words is "one hundred twenty-seven million, two hundred one thousand, six hundred eighty-one".