129822257549 has 4 divisors (see below), whose sum is σ = 129831538620. Its totient is φ = 129812976480.

The previous prime is 129822257491. The next prime is 129822257597. The reversal of 129822257549 is 945752228921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 945752228921 = 23 ⋅41119662127.

It can be written as a sum of positive squares in 2 ways, for example, as 50386780900 + 79435476649 = 224470^2 + 281843^2 .

It is a cyclic number.

It is not a de Polignac number, because 129822257549 - 2³⁶ = 61102780813 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129822257494 and 129822257503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129822257249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4619522 + ... + 4647539.

It is an arithmetic number, because the mean of its divisors is an integer number (32457884655).

Almost surely, 2^129822257549 is an apocalyptic number.

It is an amenable number.

129822257549 is a deficient number, since it is larger than the sum of its proper divisors (9281071).

129822257549 is an equidigital number, since it uses as much as digits as its factorization.

129822257549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9281070.

The product of its digits is 7257600, while the sum is 56.

The spelling of 129822257549 in words is "one hundred twenty-nine billion, eight hundred twenty-two million, two hundred fifty-seven thousand, five hundred forty-nine".