129672401 has 2 divisors, whose sum is σ = 129672402. Its totient is φ = 129672400.

The previous prime is 129672317. The next prime is 129672407. The reversal of 129672401 is 104276921.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117700801 + 11971600 = 10849^2 + 3460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129672401 is a prime.

It is a super-2 number, since 2×129672401² = 33629863162209602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129672407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64836200 + 64836201.

It is an arithmetic number, because the mean of its divisors is an integer number (64836201).

Almost surely, 2^129672401 is an apocalyptic number.

It is an amenable number.

129672401 is a deficient number, since it is larger than the sum of its proper divisors (1).

129672401 is an equidigital number, since it uses as much as digits as its factorization.

129672401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 129672401 is about 11387.3790224090. The cubic root of 129672401 is about 506.1538183177.

The spelling of 129672401 in words is "one hundred twenty-nine million, six hundred seventy-two thousand, four hundred one".