129812841 has 24 divisors (see below), whose sum is σ = 198758880. Its totient is φ = 83733480.

The previous prime is 129812831. The next prime is 129812849. The reversal of 129812841 is 148218921.

It is a happy number.

It is not a de Polignac number, because 129812841 - 2⁶ = 129812777 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129812796 and 129812805.

It is not an unprimeable number, because it can be changed into a prime (129812849) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23446 + ... + 28448.

It is an arithmetic number, because the mean of its divisors is an integer number (8281620).

Almost surely, 2^129812841 is an apocalyptic number.

It is an amenable number.

129812841 is a deficient number, since it is larger than the sum of its proper divisors (68946039).

129812841 is an equidigital number, since it uses as much as digits as its factorization.

129812841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5074 (or 5037 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 129812841 is about 11393.5438297309. The cubic root of 129812841 is about 506.3364801507.

The spelling of 129812841 in words is "one hundred twenty-nine million, eight hundred twelve thousand, eight hundred forty-one".