129620081 has 2 divisors, whose sum is σ = 129620082. Its totient is φ = 129620080.

The previous prime is 129620069. The next prime is 129620129. The reversal of 129620081 is 180026921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71250481 + 58369600 = 8441^2 + 7640^2 .

It is a cyclic number.

It is not a de Polignac number, because 129620081 - 2¹⁸ = 129357937 is a prime.

It is a super-3 number, since 3×129620081³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129625081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64810040 + 64810041.

It is an arithmetic number, because the mean of its divisors is an integer number (64810041).

Almost surely, 2^129620081 is an apocalyptic number.

It is an amenable number.

129620081 is a deficient number, since it is larger than the sum of its proper divisors (1).

129620081 is an equidigital number, since it uses as much as digits as its factorization.

129620081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 129620081 is about 11385.0815104680. The cubic root of 129620081 is about 506.0857351327.

The spelling of 129620081 in words is "one hundred twenty-nine million, six hundred twenty thousand, eighty-one".