129644831 has 2 divisors, whose sum is σ = 129644832. Its totient is φ = 129644830.

The previous prime is 129644783. The next prime is 129644843. The reversal of 129644831 is 138446921.

It is a strong prime.

It is an emirp because it is prime and its reverse (138446921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129644831 is a prime.

It is a super-2 number, since 2×129644831² = 33615564410037122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129644891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64822415 + 64822416.

It is an arithmetic number, because the mean of its divisors is an integer number (64822416).

Almost surely, 2^129644831 is an apocalyptic number.

129644831 is a deficient number, since it is larger than the sum of its proper divisors (1).

129644831 is an equidigital number, since it uses as much as digits as its factorization.

129644831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 38.

The square root of 129644831 is about 11386.1684073265. The cubic root of 129644831 is about 506.1179441976.

The spelling of 129644831 in words is "one hundred twenty-nine million, six hundred forty-four thousand, eight hundred thirty-one".