129240031 has 8 divisors (see below), whose sum is σ = 131706000. Its totient is φ = 126783360.

The previous prime is 129240019. The next prime is 129240053. The reversal of 129240031 is 130042921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129240031 - 2²⁵ = 95685599 is a prime.

It is a super-2 number, since 2×129240031² = 33405971225761922, 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 = 129239984 and 129240011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129240011) 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 in 7 ways as a sum of consecutive naturals, for example, 29895 + ... + 33943.

It is an arithmetic number, because the mean of its divisors is an integer number (16463250).

Almost surely, 2^129240031 is an apocalyptic number.

129240031 is a deficient number, since it is larger than the sum of its proper divisors (2465969).

129240031 is an equidigital number, since it uses as much as digits as its factorization.

129240031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4649.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 129240031 is about 11368.3785563290. The cubic root of 129240031 is about 505.5906313671.

Adding to 129240031 its reverse (130042921), we get a palindrome (259282952).

The spelling of 129240031 in words is "one hundred twenty-nine million, two hundred forty thousand, thirty-one".