129211361 has 2 divisors, whose sum is σ = 129211362. Its totient is φ = 129211360.

The previous prime is 129211331. The next prime is 129211367. The reversal of 129211361 is 163112921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109851361 + 19360000 = 10481^2 + 4400^2 .

It is a cyclic number.

It is not a de Polignac number, because 129211361 - 2¹⁰ = 129210337 is a prime.

It is a super-2 number, since 2×129211361² = 33391151622944642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 129211361.

It is not a weakly prime, because it can be changed into another prime (129211367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64605680 + 64605681.

It is an arithmetic number, because the mean of its divisors is an integer number (64605681).

Almost surely, 2^129211361 is an apocalyptic number.

It is an amenable number.

129211361 is a deficient number, since it is larger than the sum of its proper divisors (1).

129211361 is an equidigital number, since it uses as much as digits as its factorization.

129211361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 26.

The square root of 129211361 is about 11367.1175326025. The cubic root of 129211361 is about 505.5532426538.

The spelling of 129211361 in words is "one hundred twenty-nine million, two hundred eleven thousand, three hundred sixty-one".