561165306 has 16 divisors (see below), whose sum is σ = 1208663904. Its totient is φ = 172666224.

The previous prime is 561165299. The next prime is 561165307. The reversal of 561165306 is 603561165.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (561165307) 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 7 ways as a sum of consecutive naturals, for example, 3597136 + ... + 3597291.

It is an arithmetic number, because the mean of its divisors is an integer number (75541494).

Almost surely, 2^561165306 is an apocalyptic number.

561165306 is an abundant number, since it is smaller than the sum of its proper divisors (647498598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561165306 is a wasteful number, since it uses less digits than its factorization.

561165306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7194445.

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 561165306 is about 23688.9279200220. The cubic root of 561165306 is about 824.8283969990.

The spelling of 561165306 in words is "five hundred sixty-one million, one hundred sixty-five thousand, three hundred six".