561011165 has 32 divisors (see below), whose sum is σ = 798408576. Its totient is φ = 373052160.

The previous prime is 561011149. The next prime is 561011179. The reversal of 561011165 is 561110165.

561011165 = 13² + 14² + ... + 1189².

561011165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 561011165 - 2⁴ = 561011149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72839 + ... + 80171.

It is an arithmetic number, because the mean of its divisors is an integer number (24950268).

Almost surely, 2^561011165 is an apocalyptic number.

561011165 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

561011165 is a deficient number, since it is larger than the sum of its proper divisors (237397411).

561011165 is a wasteful number, since it uses less digits than its factorization.

561011165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7469.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 561011165 is about 23685.6742568161. The cubic root of 561011165 is about 824.7528687394.

The spelling of 561011165 in words is "five hundred sixty-one million, eleven thousand, one hundred sixty-five".