129902401 has 2 divisors, whose sum is σ = 129902402. Its totient is φ = 129902400.

The previous prime is 129902371. The next prime is 129902447. The reversal of 129902401 is 104209921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121022001 + 8880400 = 11001^2 + 2980^2 .

It is a cyclic number.

It is not a de Polignac number, because 129902401 - 2⁷ = 129902273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129902401.

It is not a weakly prime, because it can be changed into another prime (129902471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64951200 + 64951201.

It is an arithmetic number, because the mean of its divisors is an integer number (64951201).

Almost surely, 2^129902401 is an apocalyptic number.

It is an amenable number.

129902401 is a deficient number, since it is larger than the sum of its proper divisors (1).

129902401 is an equidigital number, since it uses as much as digits as its factorization.

129902401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 129902401 is about 11397.4734480937. The cubic root of 129902401 is about 506.4528966525.

The spelling of 129902401 in words is "one hundred twenty-nine million, nine hundred two thousand, four hundred one".