561829121 has 4 divisors (see below), whose sum is σ = 642090432. Its totient is φ = 481567812.

The previous prime is 561829111. The next prime is 561829123. The reversal of 561829121 is 121928165.

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 561829121 - 2⁶ = 561829057 is a prime.

It is a super-2 number, since 2×561829121² = 631303922407265282, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (561829123) 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 3 ways as a sum of consecutive naturals, for example, 40130645 + ... + 40130658.

It is an arithmetic number, because the mean of its divisors is an integer number (160522608).

Almost surely, 2^561829121 is an apocalyptic number.

It is an amenable number.

561829121 is a deficient number, since it is larger than the sum of its proper divisors (80261311).

561829121 is an equidigital number, since it uses as much as digits as its factorization.

561829121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80261310.

The product of its digits is 8640, while the sum is 35.

The square root of 561829121 is about 23702.9348604767. The cubic root of 561829121 is about 825.1535048307.

The spelling of 561829121 in words is "five hundred sixty-one million, eight hundred twenty-nine thousand, one hundred twenty-one".