129477242549 has 4 divisors (see below), whose sum is σ = 129494566764. Its totient is φ = 129459918336.

The previous prime is 129477242539. The next prime is 129477242563. The reversal of 129477242549 is 945242774921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 111415764100 + 18061478449 = 333790^2 + 134393^2 .

It is a cyclic number.

It is not a de Polignac number, because 129477242549 - 2¹² = 129477238453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129477242494 and 129477242503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129477242539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8650892 + ... + 8665845.

It is an arithmetic number, because the mean of its divisors is an integer number (32373641691).

Almost surely, 2^129477242549 is an apocalyptic number.

It is an amenable number.

129477242549 is a deficient number, since it is larger than the sum of its proper divisors (17324215).

129477242549 is an equidigital number, since it uses as much as digits as its factorization.

129477242549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17324214.

The product of its digits is 10160640, while the sum is 56.

The spelling of 129477242549 in words is "one hundred twenty-nine billion, four hundred seventy-seven million, two hundred forty-two thousand, five hundred forty-nine".