129401281 has 2 divisors, whose sum is σ = 129401282. Its totient is φ = 129401280.

The previous prime is 129401227. The next prime is 129401287. The reversal of 129401281 is 182104921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113529025 + 15872256 = 10655^2 + 3984^2 .

It is a cyclic number.

It is not a de Polignac number, because 129401281 - 2¹¹ = 129399233 is a prime.

It is a super-2 number, since 2×129401281² = 33489383048881922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129401287) 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, 64700640 + 64700641.

It is an arithmetic number, because the mean of its divisors is an integer number (64700641).

Almost surely, 2^129401281 is an apocalyptic number.

It is an amenable number.

129401281 is a deficient number, since it is larger than the sum of its proper divisors (1).

129401281 is an equidigital number, since it uses as much as digits as its factorization.

129401281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 129401281 is about 11375.4683859611. The cubic root of 129401281 is about 505.8008154870.

The spelling of 129401281 in words is "one hundred twenty-nine million, four hundred one thousand, two hundred eighty-one".