129300031 has 4 divisors (see below), whose sum is σ = 147771472. Its totient is φ = 110828592.

The previous prime is 129300029. The next prime is 129300071. The reversal of 129300031 is 130003921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130003921 = 43 ⋅3023347.

It is not a de Polignac number, because 129300031 - 2¹ = 129300029 is a prime.

It is a super-2 number, since 2×129300031² = 33436996033201922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129299981 and 129300008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129300071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9235710 + ... + 9235723.

It is an arithmetic number, because the mean of its divisors is an integer number (36942868).

Almost surely, 2^129300031 is an apocalyptic number.

129300031 is a deficient number, since it is larger than the sum of its proper divisors (18471441).

129300031 is an equidigital number, since it uses as much as digits as its factorization.

129300031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18471440.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 129300031 is about 11371.0171488746. The cubic root of 129300031 is about 505.6688598242.

Adding to 129300031 its reverse (130003921), we get a palindrome (259303952).

The spelling of 129300031 in words is "one hundred twenty-nine million, three hundred thousand, thirty-one".