129036431 has 2 divisors, whose sum is σ = 129036432. Its totient is φ = 129036430.

The previous prime is 129036377. The next prime is 129036433. The reversal of 129036431 is 134630921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129036431 - 2¹⁰ = 129035407 is a prime.

It is a super-2 number, since 2×129036431² = 33300801050435522, which contains 22 as substring.

Together with 129036433, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 129036394 and 129036403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129036433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64518215 + 64518216.

It is an arithmetic number, because the mean of its divisors is an integer number (64518216).

Almost surely, 2^129036431 is an apocalyptic number.

129036431 is a deficient number, since it is larger than the sum of its proper divisors (1).

129036431 is an equidigital number, since it uses as much as digits as its factorization.

129036431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 129036431 is about 11359.4203637334. The cubic root of 129036431 is about 505.3249955210.

The spelling of 129036431 in words is "one hundred twenty-nine million, thirty-six thousand, four hundred thirty-one".