561641129 has 4 divisors (see below), whose sum is σ = 641875584. Its totient is φ = 481406676.

The previous prime is 561641107. The next prime is 561641137. The reversal of 561641129 is 921146165.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 561641129 - 2²⁸ = 293205673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561641149) 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, 40117217 + ... + 40117230.

It is an arithmetic number, because the mean of its divisors is an integer number (160468896).

Almost surely, 2^561641129 is an apocalyptic number.

It is an amenable number.

561641129 is a deficient number, since it is larger than the sum of its proper divisors (80234455).

561641129 is an equidigital number, since it uses as much as digits as its factorization.

561641129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80234454.

The product of its digits is 12960, while the sum is 35.

The square root of 561641129 is about 23698.9689438169. The cubic root of 561641129 is about 825.0614604962.

The spelling of 561641129 in words is "five hundred sixty-one million, six hundred forty-one thousand, one hundred twenty-nine".