545511561 has 12 divisors (see below), whose sum is σ = 846099792. Its totient is φ = 311720808.

The previous prime is 545511523. The next prime is 545511569. The reversal of 545511561 is 165115545.

It is not a de Polignac number, because 545511561 - 2²⁵ = 511957129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (545511569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1855335 + ... + 1855628.

It is an arithmetic number, because the mean of its divisors is an integer number (70508316).

Almost surely, 2^545511561 is an apocalyptic number.

It is an amenable number.

545511561 is a deficient number, since it is larger than the sum of its proper divisors (300588231).

545511561 is a wasteful number, since it uses less digits than its factorization.

545511561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3710980 (or 3710973 counting only the distinct ones).

The product of its digits is 15000, while the sum is 33.

The square root of 545511561 is about 23356.1889228530. The cubic root of 545511561 is about 817.0864082650.

The spelling of 545511561 in words is "five hundred forty-five million, five hundred eleven thousand, five hundred sixty-one".