561129829 has 8 divisors (see below), whose sum is σ = 639840600. Its totient is φ = 487497216.

The previous prime is 561129823. The next prime is 561129839. The reversal of 561129829 is 928921165.

It can be written as a sum of positive squares in 4 ways, for example, as 4264225 + 556865604 = 2065^2 + 23598^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 561129829 - 2²⁹ = 24258917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561129823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1269304 + ... + 1269745.

It is an arithmetic number, because the mean of its divisors is an integer number (79980075).

Almost surely, 2^561129829 is an apocalyptic number.

It is an amenable number.

561129829 is a deficient number, since it is larger than the sum of its proper divisors (78710771).

561129829 is a wasteful number, since it uses less digits than its factorization.

561129829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2539079.

The product of its digits is 77760, while the sum is 43.

The square root of 561129829 is about 23688.1790984449. The cubic root of 561129829 is about 824.8110146855.

The spelling of 561129829 in words is "five hundred sixty-one million, one hundred twenty-nine thousand, eight hundred twenty-nine".