129200031 has 6 divisors (see below), whose sum is σ = 186622280. Its totient is φ = 86133348.

The previous prime is 129200011. The next prime is 129200047. The reversal of 129200031 is 130002921.

It is a happy number.

It is not a de Polignac number, because 129200031 - 2⁹ = 129199519 is a prime.

It is a super-2 number, since 2×129200031² = 33385296020801922, 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 = 129199977 and 129200013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129200011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7177771 + ... + 7177788.

Almost surely, 2^129200031 is an apocalyptic number.

129200031 is a deficient number, since it is larger than the sum of its proper divisors (57422249).

129200031 is a wasteful number, since it uses less digits than its factorization.

129200031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14355565 (or 14355562 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 129200031 is about 11366.6191543484. The cubic root of 129200031 is about 505.5384656104.

Adding to 129200031 its reverse (130002921), we get a palindrome (259202952).

The spelling of 129200031 in words is "one hundred twenty-nine million, two hundred thousand, thirty-one".