129123290247 has 16 divisors (see below), whose sum is σ = 196911044352. Its totient is φ = 73727832960.

The previous prime is 129123290227. The next prime is 129123290251. The reversal of 129123290247 is 742092321921.

It is not a de Polignac number, because 129123290247 - 2¹⁰ = 129123289223 is a prime.

It is a super-4 number, since 4×129123290247⁴ (a number of 46 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 129123290199 and 129123290208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129123290227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2343129 + ... + 2397602.

It is an arithmetic number, because the mean of its divisors is an integer number (12306940272).

Almost surely, 2^129123290247 is an apocalyptic number.

129123290247 is a deficient number, since it is larger than the sum of its proper divisors (67787754105).

129123290247 is a wasteful number, since it uses less digits than its factorization.

129123290247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4742038.

The product of its (nonzero) digits is 108864, while the sum is 42.

The spelling of 129123290247 in words is "one hundred twenty-nine billion, one hundred twenty-three million, two hundred ninety thousand, two hundred forty-seven".