129424850861 has 8 divisors (see below), whose sum is σ = 131129584824. Its totient is φ = 127727677440.

The previous prime is 129424850851. The next prime is 129424850881. The reversal of 129424850861 is 168058424921.

It can be written as a sum of positive squares in 4 ways, for example, as 23998657225 + 105426193636 = 154915^2 + 324694^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129424850861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129424850851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1855670 + ... + 1924151.

It is an arithmetic number, because the mean of its divisors is an integer number (16391198103).

Almost surely, 2^129424850861 is an apocalyptic number.

It is an amenable number.

129424850861 is a deficient number, since it is larger than the sum of its proper divisors (1704733963).

129424850861 is an equidigital number, since it uses as much as digits as its factorization.

129424850861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3780271.

The product of its (nonzero) digits is 1105920, while the sum is 50.

The spelling of 129424850861 in words is "one hundred twenty-nine billion, four hundred twenty-four million, eight hundred fifty thousand, eight hundred sixty-one".