129694174919981 has 4 divisors (see below), whose sum is σ = 148221914194272. Its totient is φ = 111166435645692.

The previous prime is 129694174919899. The next prime is 129694174919983. The reversal of 129694174919981 is 189919471496921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 129694174919981 - 2¹⁴ = 129694174903597 is a prime.

It is a super-2 number, since 2×129694174919981² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129694174919896 and 129694174919905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129694174919983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9263869637135 + ... + 9263869637148.

It is an arithmetic number, because the mean of its divisors is an integer number (37055478548568).

Almost surely, 2^{129694174919981} is an apocalyptic number.

It is an amenable number.

129694174919981 is a deficient number, since it is larger than the sum of its proper divisors (18527739274291).

129694174919981 is an equidigital number, since it uses as much as digits as its factorization.

129694174919981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18527739274290.

The product of its digits is 634894848, while the sum is 80.

The spelling of 129694174919981 in words is "one hundred twenty-nine trillion, six hundred ninety-four billion, one hundred seventy-four million, nine hundred nineteen thousand, nine hundred eighty-one".