561000165 has 24 divisors (see below), whose sum is σ = 986621664. Its totient is φ = 271999200.

The previous prime is 561000163. The next prime is 561000173.

561000165 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 561000165 - 2¹ = 561000163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561000163) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 152731 + ... + 156360.

It is an arithmetic number, because the mean of its divisors is an integer number (41109236).

Almost surely, 2^561000165 is an apocalyptic number.

561000165 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

561000165 is a deficient number, since it is larger than the sum of its proper divisors (425621499).

561000165 is a wasteful number, since it uses less digits than its factorization.

561000165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309121 (or 309110 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 561000165 is about 23685.4420478065. The cubic root of 561000165 is about 824.7474782698.

It can be divided in two parts, 561000 and 165, that added together give a palindrome (561165).

The spelling of 561000165 in words is "five hundred sixty-one million, one hundred sixty-five", and thus it is an aban number.