129401968819 has 4 divisors (see below), whose sum is σ = 129402960480. Its totient is φ = 129400977160.

The previous prime is 129401968769. The next prime is 129401968847. The reversal of 129401968819 is 918869104921.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 129401968819 - 2¹³ = 129401960627 is a prime.

It is a super-2 number, since 2×129401968819² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129401968889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263947 + ... + 573124.

It is an arithmetic number, because the mean of its divisors is an integer number (32350740120).

Almost surely, 2^129401968819 is an apocalyptic number.

129401968819 is a deficient number, since it is larger than the sum of its proper divisors (991661).

129401968819 is an equidigital number, since it uses as much as digits as its factorization.

129401968819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991660.

The product of its (nonzero) digits is 2239488, while the sum is 58.

The spelling of 129401968819 in words is "one hundred twenty-nine billion, four hundred one million, nine hundred sixty-eight thousand, eight hundred nineteen".