561612169 has 4 divisors (see below), whose sum is σ = 561821440. Its totient is φ = 561402900.

The previous prime is 561612109. The next prime is 561612179. The reversal of 561612169 is 961216165.

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 561612169 - 2¹⁵ = 561579401 is a prime.

It is a super-2 number, since 2×561612169² = 630816456737769122, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561612109) 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, 100557 + ... + 105994.

It is an arithmetic number, because the mean of its divisors is an integer number (140455360).

Almost surely, 2^561612169 is an apocalyptic number.

It is an amenable number.

561612169 is a deficient number, since it is larger than the sum of its proper divisors (209271).

561612169 is a wasteful number, since it uses less digits than its factorization.

561612169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209270.

The product of its digits is 19440, while the sum is 37.

The square root of 561612169 is about 23698.3579388953. The cubic root of 561612169 is about 825.0472793229.

The spelling of 561612169 in words is "five hundred sixty-one million, six hundred twelve thousand, one hundred sixty-nine".