129842753569 has 3 divisors (see below), whose sum is σ = 129843113907. Its totient is φ = 129842393232.

The previous prime is 129842753563. The next prime is 129842753597. The reversal of 129842753569 is 965357248921.

The square root of 129842753569 is 360337.

It is a perfect power (a square), and thus also a powerful number.

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 can be written as a sum of positive squares in only one way, i.e., 91939336225 + 37903417344 = 303215^2 + 194688^2 .

It is not a de Polignac number, because 129842753569 - 2¹³ = 129842745377 is a prime.

It is a super-2 number, since 2×129842753569² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129842753563) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 180169 + ... + 540505.

It is an arithmetic number, because the mean of its divisors is an integer number (43281037969).

Almost surely, 2^129842753569 is an apocalyptic number.

129842753569 is the 360337-th square number.

129842753569 is the 180169-th centered octagonal number.

It is an amenable number.

129842753569 is a deficient number, since it is larger than the sum of its proper divisors (360338).

129842753569 is an frugal number, since it uses more digits than its factorization.

129842753569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720674 (or 360337 counting only the distinct ones).

The product of its digits is 32659200, while the sum is 61.

The spelling of 129842753569 in words is "one hundred twenty-nine billion, eight hundred forty-two million, seven hundred fifty-three thousand, five hundred sixty-nine".