561969165 has 16 divisors (see below), whose sum is σ = 921082176. Its totient is φ = 292406400.

The previous prime is 561969139. The next prime is 561969167.

561969165 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 561969165 - 2¹¹ = 561967117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561969167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 456271 + ... + 457500.

It is an arithmetic number, because the mean of its divisors is an integer number (57567636).

Almost surely, 2^561969165 is an apocalyptic number.

It is an amenable number.

561969165 is a deficient number, since it is larger than the sum of its proper divisors (359113011).

561969165 is a wasteful number, since it uses less digits than its factorization.

561969165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913820.

The product of its digits is 437400, while the sum is 48.

The square root of 561969165 is about 23705.8888253531. Note that the first 4 decimals coincide. The cubic root of 561969165 is about 825.2220595999. Note that the first 3 decimals are identical.

The spelling of 561969165 in words is "five hundred sixty-one million, nine hundred sixty-nine thousand, one hundred sixty-five".