129130931 has 4 divisors (see below), whose sum is σ = 129170664. Its totient is φ = 129091200.

The previous prime is 129130927. The next prime is 129130943. The reversal of 129130931 is 139031921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 139031921 = 7 ⋅19861703.

It is a cyclic number.

It is not a de Polignac number, because 129130931 - 2² = 129130927 is a prime.

It is a super-2 number, since 2×129130931² = 33349594681853522, 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 = 129130894 and 129130903.

It is not an unprimeable number, because it can be changed into a prime (129130031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14510 + ... + 21651.

It is an arithmetic number, because the mean of its divisors is an integer number (32292666).

Almost surely, 2^129130931 is an apocalyptic number.

129130931 is a deficient number, since it is larger than the sum of its proper divisors (39733).

129130931 is an equidigital number, since it uses as much as digits as its factorization.

129130931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39732.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 129130931 is about 11363.5791456741. The cubic root of 129130931 is about 505.4483238944.

The spelling of 129130931 in words is "one hundred twenty-nine million, one hundred thirty thousand, nine hundred thirty-one".