129516031 has 2 divisors, whose sum is σ = 129516032. Its totient is φ = 129516030.

The previous prime is 129516029. The next prime is 129516073. The reversal of 129516031 is 130615921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129516031 - 2¹ = 129516029 is a prime.

It is a super-2 number, since 2×129516031² = 33548804571985922, which contains 22 as substring.

Together with 129516029, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129514031) 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, 64758015 + 64758016.

It is an arithmetic number, because the mean of its divisors is an integer number (64758016).

Almost surely, 2^129516031 is an apocalyptic number.

129516031 is a deficient number, since it is larger than the sum of its proper divisors (1).

129516031 is an equidigital number, since it uses as much as digits as its factorization.

129516031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 129516031 is about 11380.5110166460. The cubic root of 129516031 is about 505.9502820538.

The spelling of 129516031 in words is "one hundred twenty-nine million, five hundred sixteen thousand, thirty-one".