129405401 has 2 divisors, whose sum is σ = 129405402. Its totient is φ = 129405400.

The previous prime is 129405373. The next prime is 129405413. The reversal of 129405401 is 104504921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85581001 + 43824400 = 9251^2 + 6620^2 .

It is a cyclic number.

It is not a de Polignac number, because 129405401 - 2¹⁴ = 129389017 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129405901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64702700 + 64702701.

It is an arithmetic number, because the mean of its divisors is an integer number (64702701).

Almost surely, 2^129405401 is an apocalyptic number.

It is an amenable number.

129405401 is a deficient number, since it is larger than the sum of its proper divisors (1).

129405401 is an equidigital number, since it uses as much as digits as its factorization.

129405401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 129405401 is about 11375.6494759640. The cubic root of 129405401 is about 505.8061834844.

The spelling of 129405401 in words is "one hundred twenty-nine million, four hundred five thousand, four hundred one".